Weather & Environment APIs
This category runs from daily forecasts to the wider environment: air quality, climate and carbon data, astronomy, natural disasters and energy. Government sources are well represented, including the US National Weather Service and NASA FIRMS for fire hotspots, both free. Commercial providers such as OpenWeather and Tomorrow.io sell forecasts with free tiers, and Open-Meteo works without a key. Free Weather APIs →
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
1ClickImpactPay-per-action API to plant trees, capture carbon, or clean oceans, with GPS-verified impact tracking. Weather & Environment › Climate & Carbon | Freemium | API key | JSON | <100/day | Live |
7Timer!GFS-based multi-day forecasts by coordinate, including sky seeing and transparency for stargazing. Weather & Environment › Astronomy | Free | None | JSON | Unlimited | Live |
AccuWeatherCurrent conditions, forecasts, alerts and indices for locations worldwide from AccuWeather. Weather & Environment › Weather Forecasts | Freemium | API key | JSON | 100–1k/day | Live |
AEMET OpenDataOfficial Spanish weather forecasts, observations, and climate data, key required. Weather & Environment › Weather Forecasts | Free | API key | JSON | — | Live |
AirNowHourly AQI observations and daily air quality forecasts for the US, Canada and Mexico by zip or coordinate. Weather & Environment › Air Quality | Free | API key | JSON | — | Live |
APIXUDiscontinued weather API; apixu.com now server-redirects permanently to Weatherstack. Weather & Environment › Weather Forecasts | — | Deprecated | |||
AQICN (World Air Quality Index)Real-time air quality index, pollutant levels, and forecasts from 11,000+ global monitoring stations. Weather & Environment › Air Quality | Free | API key | JSON | 10k+/day | Live |
AstronomyAPISun, Moon and planet positions and events for any place and date, plus rendered star charts and moon images. Weather & Environment › Astronomy | Free | API key | JSON | Unlimited | Live |
AviationWeather (NOAA Aviation Weather Center)NOAA aviation weather: live METARs, TAFs, PIREPs, and SIGMETs for airports worldwide. Weather & Environment › Weather Forecasts | Free | None | JSON | 10k+/day | Live |
Bright SkyGerman DWD weather warnings by municipality, rain radar, hourly observations and forecasts as JSON, no key. Weather & Environment › Natural Disasters | Free | None | JSON | Unlimited | Live |
Canadian Wildland Fire Information SystemCanada's reported wildfires, satellite hotspots, fire perimeters and fire-danger maps via OGC services. Weather & Environment › Natural Disasters | Free | None | JSON | Unlimited | Live |
Carbon InterfaceEstimates CO2 emissions from electricity, flights, vehicles, shipping and fuel via REST. Weather & Environment › Climate & Carbon | Freemium | API key | JSON | <100/day | Live |
ColorfulClouds Weather APIGlobal weather forecasts with minute-by-minute nowcasting and air-quality data by coordinates. Weather & Environment › Weather Forecasts | Freemium | API key | JSON | — | Degraded |
Copernicus Climate Data StoreERA5 reanalysis back to 1940, seasonal forecasts and climate projections as gridded files via queued jobs. Weather & Environment › Climate & Carbon | Free | API key | JSON | Unlimited | Live |
CycleCalcsComputed sun, moon, planet, and eclipse data for any location and date, no key needed. Weather & Environment › Astronomy | Freemium | None | JSON | 1k–10k/day | Live |
Dark SkyRetired minute-by-minute forecast service bought by Apple; its successor is the WeatherKit REST API. Weather & Environment › Weather Forecasts | — | Deprecated | |||
Elpriser i dagSwedish electricity spot prices by zone in 15-minute intervals, with VAT and energy tax included. Weather & Environment › Energy | Free | None | JSON | 10k+/day | Live |
EMSC Seismic Portal FDSNEarthquake catalogue with a European focus: time, location, depth and magnitude, filterable by area and size. Weather & Environment › Natural Disasters | Free | None | JSON | Unlimited | Live |
Energi Data ServiceDanish electricity, gas, and CO2-emissions data from grid operator Energinet, updated every few minutes. Weather & Environment › Energy | Free | None | JSON | Unlimited | Live |
EPAUS EPA Air Quality System: ambient air monitor readings by site, county, or state. Weather & Environment › Air Quality | Free | API key | JSON | 10k+/day | Live |
EuskalmetBasque Country weather forecasts, station readings, ocean and tide data from the regional met agency. Weather & Environment › Weather Forecasts | Free | API key | JSON | Unlimited | Live |
Foreca Weather APIGlobal point weather forecasts plus air quality, pollen, marine and ski-resort conditions. Weather & Environment › Weather Forecasts | Freemium | API key | JSON | 1k–10k/day | Untested |
GeoNet API (New Zealand)New Zealand quakes, felt-shaking intensity, strong motion, volcanic alert levels and hazard news. Weather & Environment › Natural Disasters | Free | None | JSON | Unlimited | Live |
Google Earth EngineCloud platform for analyzing petabytes of satellite imagery and other geospatial/environmental datasets. Weather & Environment › Climate & Carbon | Freemium | OAuth | JSON | — | Live |
GribStreamForecast, satellite/radar and historical weather data by coordinate, queried against GFS, HRRR and NBM models. Weather & Environment › Weather Forecasts | Freemium | API key | JSON | — | Live |
GridHubLive and historical wholesale electricity prices, demand, and carbon intensity across 25 grid zones. Weather & Environment › Energy | Freemium | API key | JSON | 100–1k/day | Live |
Grill IndexScores backyard grilling conditions 0-100 from live weather, with best-window and weekly forecasts. Weather & Environment › Weather Forecasts | Free | None | JSON | 10k+/day | Live |
GrünstromIndexHourly forecast of Germany's regional green power share, CO2 intensity, and price by postal code. Weather & Environment › Energy | Freemium | None | JSON | — | Live |
Hail HistoryLooks up NOAA NEXRAD-detected hail history for a US address or coordinate, by year and day. Weather & Environment › Natural Disasters | Free | None | JSON | Unlimited | Live |
HG WeatherCurrent conditions and 15-day forecasts for Brazilian cities, plus up to 3 years of history. Weather & Environment › Weather Forecasts | Freemium | API key | JSON | 100–1k/day | Live |
Hong Kong Observatory Open DataReal-time Hong Kong weather, warnings, forecasts, climate records and worldwide M6+ earthquake data. Weather & Environment › Weather Forecasts | Free | None | JSON | Unlimited | Live |
IPMAPortuguese government weather forecasts, sea state, UV index, fire risk, and seismic data, no key needed. Weather & Environment › Weather Forecasts | Free | None | JSON | Unlimited | Live |
IQAir AirVisualCurrent US and China AQI plus weather for the nearest city by GPS, IP or name, from hourly station readings Weather & Environment › Air Quality | Freemium | API key | JSON | 100–1k/day | Live |
kanariNear real-time wildfire clusters worldwide from satellite feeds and verified citizen reports. Weather & Environment › Natural Disasters | Free | None | JSON | 1k–10k/day | Live |
KNMILists and downloads KNMI's raw weather observation, radar and climate datasets by dataset name and version. Weather & Environment › Weather Forecasts | Free | API key | JSON | 10k+/day | Live |
Korea Meteorological AdministrationOfficial South Korean weather observations, forecasts and climate records back to 1904. Weather & Environment › Weather Forecasts | API key | JSON | — | Untested | |
LuchtmeetnetReal-time and forecast air quality measurements from Dutch government monitoring stations. Weather & Environment › Air Quality | Free | None | JSON | 10k+/day | Live |
MET Norway LocationforecastNine-day point forecasts for any latitude/longitude with weather symbol codes and UV, richest for the Nordics Weather & Environment › Weather Forecasts | Free | None | JSON | 10k+/day | Live |
Met Office DataPointUK Met Office's original forecast/observation API for weather stations and sites; now decommissioned. Weather & Environment › Weather Forecasts | — | Deprecated | |||
Météo-France API PortalOfficial French weather forecasts, radar, climate and vigilance-alert data from 22 Météo-France APIs. Weather & Environment › Weather Forecasts | Free | OAuth | JSON | 10k+/day | Live |
MeteoblueSwiss forecast, historical and dataset weather API with credit-metered packages for many variables. Weather & Environment › Weather Forecasts | Freemium | API key | JSON | — | Live |
Meteorologisk InstituttNorway's national weather service: global forecasts plus Nordic marine, aviation and nowcast data. Weather & Environment › Weather Forecasts | Free | None | JSON | Unlimited | Live |
MeteosourceGlobal current, hourly and 30-day forecasts blending weather models with AI, plus air quality data. Weather & Environment › Weather Forecasts | Freemium | API key | JSON | 100–1k/day | Live |
MeteostatHistorical hourly, daily and monthly weather records and climate normals for stations or any lat/lon point. Weather & Environment › Climate & Carbon | Freemium | API key | JSON | <100/day | Live |
Moon APIMoon phase name, illumination, age, moonrise and moonset, lunar position and next full or new moon. Weather & Environment › Astronomy | Freemium | API key | JSON | 100–1k/day | Live |
MoonloraMoon phase, illumination, moon sign, and moonrise/moonset data for 1900–2100. Weather & Environment › Astronomy | Free | None | JSON | Unlimited | Live |
MSC GeoMet OGC API (Environment Canada)Canadian weather alerts as GeoJSON polygons, plus marine forecasts, river levels and climate records. Weather & Environment › Natural Disasters | Free | None | JSON | Unlimited | Live |
NASA EONETCurated feed of active natural events (wildfires, storms, volcanoes, floods) with locations and sources. Weather & Environment › Natural Disasters | Free | None | JSON | Unlimited | Live |
NASA FIRMSSatellite active-fire hotspots from MODIS, VIIRS and Landsat by bounding box and date, near real-time. Weather & Environment › Natural Disasters | Free | API key | CSV | 10k+/day | Live |
NASA POWERProvides NASA satellite-derived solar radiation, temperature, and weather-model data by coordinate and date. Weather & Environment › Climate & Carbon | Free | None | JSON | Unlimited | Live |
National Weather ServiceOfficial US forecasts on a 2.5 km grid, active watches and warnings, and station observations, as GeoJSON. Weather & Environment › Weather Forecasts | Free | None | JSON | Unlimited | Live |
NOAA Climate Data OnlineHistorical station observations and daily-to-yearly climate summaries from NOAA's archive, by station or area. Weather & Environment › Climate & Carbon | Free | API key | JSON | 10k+/day | Live |
NOAA CO-OPS Tides & CurrentsTide predictions, observed water levels, currents and coastal weather from NOAA stations, back decades. Weather & Environment › Weather Forecasts | None | JSON | Unlimited | Live | |
OikolabGlobal hourly historical (from 1940) and forecast weather data by location, billed per data unit. Weather & Environment › Weather Forecasts | Paid | API key | JSON | — | Live |
Open-MeteoHourly and daily forecasts up to 16 days built from national weather-service models, callable without a key. Weather & Environment › Weather Forecasts | Freemium | None | JSON | 10k+/day | Live |
Open-Meteo Ensemble APIPer-member probabilistic forecasts (18-51 ensemble runs) from ICON, GFS, ECMWF and other models. Weather & Environment › Weather Forecasts | Freemium | None | JSON | 10k+/day | Live |
Open-Meteo Marine Weather APIHourly wave height, swell, sea temperature, ocean currents and tide-inclusive sea level forecasts, no key. Weather & Environment › Weather Forecasts | Freemium | None | JSON | 10k+/day | Live |
OpenAQAggregated PM2.5, NO2, O3 and other pollutant readings from ground monitoring stations worldwide. Weather & Environment › Air Quality | Freemium | API key | JSON | 10k+/day | Live |
openSenseMapLive readings from crowdsourced senseBox weather/air-quality stations worldwide. Weather & Environment › Weather Forecasts | None | JSON | Unlimited | Live | |
OpenUVReal-time and hourly UV index forecasts by latitude/longitude, with altitude and ozone adjustments. Weather & Environment › Weather Forecasts | API key | JSON | — | Live | |
OpenWeatherCurrent conditions, 5-day forecasts, air pollution and map layers for any coordinates, plus geocoding. Weather & Environment › Weather Forecasts | Freemium | API key | JSON | 10k+/day | Live |
PurpleAirLive and historical PM2.5, temperature and humidity from community sensors, by sensor or bounding box. Weather & Environment › Air Quality | Free trial | API key | JSON | — | Live |
PVGISSolar radiation and photovoltaic system output estimates for any location, from the EU's PVGIS model. Weather & Environment › Energy | None | JSON | Unlimited | Live | |
QWeatherGlobal real-time weather, forecasts, air quality, and severe alerts at 1km resolution. Weather & Environment › Weather Forecasts | Freemium | API key | JSON | 1k–10k/day | Down |
Rainbow WeatherMinute-by-minute precipitation nowcasting, cloud/precip map tiles, and hourly/daily forecasts. Weather & Environment › Weather Forecasts | Freemium | API key | JSON | 100–1k/day | Live |
RainViewerAnimated precipitation radar map tiles and forecast overlays from 1,200+ radar stations worldwide. Weather & Environment › Weather Forecasts | Free | None | JSON | — | Live |
SmartatestSwedish calculators for lighting lumens, appliance electricity cost, and barcode country prefixes. Weather & Environment › Energy | Free | None | JSON | 10k+/day | Live |
SolematicaEstimates solar panel production, ROI and cost for Italian roofs using satellite and irradiance data. Weather & Environment › Energy | Freemium | API key | JSON | — | Live |
Storm GlassMarine and weather forecasts (waves, tides, wind, temperature) blended from multiple national models. Weather & Environment › Weather Forecasts | Freemium | API key | JSON | <100/day | Live |
Strømpriser i dagHourly Norwegian electricity spot prices per zone, including VAT and government support amounts. Weather & Environment › Energy | Free | None | JSON | 100–1k/day | Live |
Sunrise SunsetSunrise, sunset, twilight, golden hour, sun position and moon phase for any coordinates, a year per call. Weather & Environment › Astronomy | Free | None | JSON | Unlimited | Live |
SunriseSunset.ioSunrise, sunset, twilight, golden and blue hour, moonrise and moon phase for any coordinates and date range. Weather & Environment › Astronomy | Free | None | JSON | Unlimited | Live |
SustainMetrics18,000+ GHG emission factors from DEFRA, EPA, ADEME and Ember for Scope 1-3 carbon footprint calculations. Weather & Environment › Climate & Carbon | Freemium | API key | JSON | <100/day | Live |
Tomorrow.ioRealtime conditions plus hourly (120h) and 5-day forecasts from proprietary models, with 60+ data layers. Weather & Environment › Weather Forecasts | Freemium | API key | JSON | — | Live |
UK Carbon Intensity APIHalf-hourly forecast and actual carbon intensity of Great Britain's electricity grid, national and regional. Weather & Environment › Energy | None | JSON | Unlimited | Live | |
USGS Earthquake CatalogSearchable global earthquake catalog by time, area, depth and magnitude, plus minute-updated GeoJSON feeds. Weather & Environment › Natural Disasters | Free | None | JSON | Unlimited | Live |
USGS Water ServicesReal-time and historical streamflow, gage height, and water-quality readings from US stations. Weather & Environment › Climate & Carbon | Free | None | JSON | Unlimited | Live |
USNO Astronomical Applications APIMoon phase dates, daily sun and moon rise/set, eclipses, seasons, Julian dates and sidereal time from USNO. Weather & Environment › Astronomy | None | JSON | Unlimited | Live | |
Visual CrossingHistorical weather back 50+ years and 15-day forecasts for any address or coordinate in one timeline query. Weather & Environment › Weather Forecasts | Freemium | API key | JSON | 1k–10k/day | Live |
WattBuyElectricity usage, utility, carbon footprint, and solar estimates for a US/Canada address. Weather & Environment › Energy | API key | JSON | — | Live | |
WeatherAPICurrent weather, 14-day forecasts, history from 2010, alerts, marine, astronomy and IP lookup. Weather & Environment › Weather Forecasts | Freemium | API key | JSON | 1k–10k/day | Live |
WeatherbitCurrent conditions, 16-day and hourly forecasts, air quality, lightning, alerts and ag/energy degree-day data. Weather & Environment › Weather Forecasts | Freemium | API key | JSON | <100/day | Live |
WeatherstackReal-time weather lookup by city or coordinates, plus historical, forecast, and astronomy data on paid plans. Weather & Environment › Weather Forecasts | Freemium | API key | JSON | <100/day | Live |
WeatherTotalsUS snow, rain and hail totals plus current aurora visibility, sourced from NOAA and NWS observations. Weather & Environment › Climate & Carbon | Free | None | JSON | 10k+/day | Live |
Website Carbon APIEstimates a webpage's CO2 emissions and carbon rating from its transfer size and hosting type. Weather & Environment › Climate & Carbon | Free | None | JSON | Unlimited | Live |
WFIGS (NIFC) wildfire incidentsCurrent U.S. wildfire incidents: name, location, size, containment and cause, refreshed every 5 minutes. Weather & Environment › Natural Disasters | Free | None | JSON | Unlimited | Live |
WorldTidesHigh and low tide times, tide heights and datums for any coastal coordinate, from harmonic station data. Weather & Environment › Weather Forecasts | Paid | API key | JSON | — | Live |
wttr.inCurrent conditions and 3-day forecast by city, airport code or coordinates as text, PNG or JSON. Weather & Environment › Weather Forecasts | Free | None | JSON | Unlimited | Live |
Xweather Weather API (formerly AerisWeather)Observations, forecasts, alerts, lightning, hail and air quality by place name or coordinate, plus map tiles. Weather & Environment › Weather Forecasts | Freemium | API key | JSON | 100–1k/day | Live |
Yandex Weather APIGlobal current conditions, hourly/10-day forecasts and history via Yandex's Meteum GraphQL API. Weather & Environment › Weather Forecasts | Free trial | API key | JSON | — | Live |
1ClickImpactFreemiumLive
Pay-per-action API to plant trees, capture carbon, or clean oceans, with GPS-verified impact tracking.
API key · JSON
<100/day
llms.txt
7Timer!FreeLive
GFS-based multi-day forecasts by coordinate, including sky seeing and transparency for stargazing.
None · JSON
Unlimited
no machine-readable spec
AccuWeatherFreemiumLive
Current conditions, forecasts, alerts and indices for locations worldwide from AccuWeather.
API key · JSON
100–1k/day
llms.txt
AEMET OpenDataFreeLive
Official Spanish weather forecasts, observations, and climate data, key required.
API key · JSON
—
no machine-readable spec
AirNowFreeLive
Hourly AQI observations and daily air quality forecasts for the US, Canada and Mexico by zip or coordinate.
API key · JSON
—
no machine-readable spec
APIXUDeprecated
Discontinued weather API; apixu.com now server-redirects permanently to Weatherstack.
·
—
no machine-readable spec
AQICN (World Air Quality Index)FreeLive
Real-time air quality index, pollutant levels, and forecasts from 11,000+ global monitoring stations.
API key · JSON
10k+/day
no machine-readable spec
AstronomyAPIFreeLive
Sun, Moon and planet positions and events for any place and date, plus rendered star charts and moon images.
API key · JSON
Unlimited
no machine-readable spec
AviationWeather (NOAA Aviation Weather Center)FreeLive
NOAA aviation weather: live METARs, TAFs, PIREPs, and SIGMETs for airports worldwide.
None · JSON
10k+/day
no machine-readable spec
Bright SkyFreeLive
German DWD weather warnings by municipality, rain radar, hourly observations and forecasts as JSON, no key.
None · JSON
Unlimited
OpenAPI spec
Canadian Wildland Fire Information SystemFreeLive
Canada's reported wildfires, satellite hotspots, fire perimeters and fire-danger maps via OGC services.
None · JSON
Unlimited
no machine-readable spec
Carbon InterfaceFreemiumLive
Estimates CO2 emissions from electricity, flights, vehicles, shipping and fuel via REST.
API key · JSON
<100/day
no machine-readable spec
ColorfulClouds Weather APIFreemiumDegraded
Global weather forecasts with minute-by-minute nowcasting and air-quality data by coordinates.
API key · JSON
—
no machine-readable spec
Copernicus Climate Data StoreFreeLive
ERA5 reanalysis back to 1940, seasonal forecasts and climate projections as gridded files via queued jobs.
API key · JSON
Unlimited
OpenAPI spec
CycleCalcsFreemiumLive
Computed sun, moon, planet, and eclipse data for any location and date, no key needed.
None · JSON
1k–10k/day
MCP server · llms.txt
Dark SkyDeprecated
Retired minute-by-minute forecast service bought by Apple; its successor is the WeatherKit REST API.
·
—
no machine-readable spec
Elpriser i dagFreeLive
Swedish electricity spot prices by zone in 15-minute intervals, with VAT and energy tax included.
None · JSON
10k+/day
no machine-readable spec
EMSC Seismic Portal FDSNFreeLive
Earthquake catalogue with a European focus: time, location, depth and magnitude, filterable by area and size.
None · JSON
Unlimited
OpenAPI spec
Energi Data ServiceFreeLive
Danish electricity, gas, and CO2-emissions data from grid operator Energinet, updated every few minutes.
None · JSON
Unlimited
OpenAPI spec
EPAFreeLive
US EPA Air Quality System: ambient air monitor readings by site, county, or state.
API key · JSON
10k+/day
OpenAPI spec
EuskalmetFreeLive
Basque Country weather forecasts, station readings, ocean and tide data from the regional met agency.
API key · JSON
Unlimited
no machine-readable spec
Foreca Weather APIFreemiumUntested
Global point weather forecasts plus air quality, pollen, marine and ski-resort conditions.
API key · JSON
1k–10k/day
llms.txt
GeoNet API (New Zealand)FreeLive
New Zealand quakes, felt-shaking intensity, strong motion, volcanic alert levels and hazard news.
None · JSON
Unlimited
no machine-readable spec
Google Earth EngineFreemiumLive
Cloud platform for analyzing petabytes of satellite imagery and other geospatial/environmental datasets.
OAuth · JSON
—
no machine-readable spec
GribStreamFreemiumLive
Forecast, satellite/radar and historical weather data by coordinate, queried against GFS, HRRR and NBM models.
API key · JSON
—
MCP server
GridHubFreemiumLive
Live and historical wholesale electricity prices, demand, and carbon intensity across 25 grid zones.
API key · JSON
100–1k/day
OpenAPI spec
Grill IndexFreeLive
Scores backyard grilling conditions 0-100 from live weather, with best-window and weekly forecasts.
None · JSON
10k+/day
OpenAPI spec
GrünstromIndexFreemiumLive
Hourly forecast of Germany's regional green power share, CO2 intensity, and price by postal code.
None · JSON
—
no machine-readable spec
Hail HistoryFreeLive
Looks up NOAA NEXRAD-detected hail history for a US address or coordinate, by year and day.
None · JSON
Unlimited
OpenAPI spec · llms.txt
HG WeatherFreemiumLive
Current conditions and 15-day forecasts for Brazilian cities, plus up to 3 years of history.
API key · JSON
100–1k/day
llms.txt
Hong Kong Observatory Open DataFreeLive
Real-time Hong Kong weather, warnings, forecasts, climate records and worldwide M6+ earthquake data.
None · JSON
Unlimited
no machine-readable spec
IPMAFreeLive
Portuguese government weather forecasts, sea state, UV index, fire risk, and seismic data, no key needed.
None · JSON
Unlimited
no machine-readable spec
IQAir AirVisualFreemiumLive
Current US and China AQI plus weather for the nearest city by GPS, IP or name, from hourly station readings
API key · JSON
100–1k/day
no machine-readable spec
kanariFreeLive
Near real-time wildfire clusters worldwide from satellite feeds and verified citizen reports.
None · JSON
1k–10k/day
llms.txt
KNMIFreeLive
Lists and downloads KNMI's raw weather observation, radar and climate datasets by dataset name and version.
API key · JSON
10k+/day
no machine-readable spec
Korea Meteorological AdministrationUntested
Official South Korean weather observations, forecasts and climate records back to 1904.
API key · JSON
—
no machine-readable spec
LuchtmeetnetFreeLive
Real-time and forecast air quality measurements from Dutch government monitoring stations.
None · JSON
10k+/day
no machine-readable spec
MET Norway LocationforecastFreeLive
Nine-day point forecasts for any latitude/longitude with weather symbol codes and UV, richest for the Nordics
None · JSON
10k+/day
OpenAPI spec
Met Office DataPointDeprecated
UK Met Office's original forecast/observation API for weather stations and sites; now decommissioned.
·
—
no machine-readable spec
Météo-France API PortalFreeLive
Official French weather forecasts, radar, climate and vigilance-alert data from 22 Météo-France APIs.
OAuth · JSON
10k+/day
OpenAPI spec
MeteoblueFreemiumLive
Swiss forecast, historical and dataset weather API with credit-metered packages for many variables.
API key · JSON
—
OpenAPI spec
Meteorologisk InstituttFreeLive
Norway's national weather service: global forecasts plus Nordic marine, aviation and nowcast data.
None · JSON
Unlimited
no machine-readable spec
MeteosourceFreemiumLive
Global current, hourly and 30-day forecasts blending weather models with AI, plus air quality data.
API key · JSON
100–1k/day
OpenAPI spec
MeteostatFreemiumLive
Historical hourly, daily and monthly weather records and climate normals for stations or any lat/lon point.
API key · JSON
<100/day
no machine-readable spec
Moon APIFreemiumLive
Moon phase name, illumination, age, moonrise and moonset, lunar position and next full or new moon.
API key · JSON
100–1k/day
OpenAPI spec
MoonloraFreeLive
Moon phase, illumination, moon sign, and moonrise/moonset data for 1900–2100.
None · JSON
Unlimited
OpenAPI spec · MCP server · llms.txt
MSC GeoMet OGC API (Environment Canada)FreeLive
Canadian weather alerts as GeoJSON polygons, plus marine forecasts, river levels and climate records.
None · JSON
Unlimited
OpenAPI spec
NASA EONETFreeLive
Curated feed of active natural events (wildfires, storms, volcanoes, floods) with locations and sources.
None · JSON
Unlimited
no machine-readable spec
NASA FIRMSFreeLive
Satellite active-fire hotspots from MODIS, VIIRS and Landsat by bounding box and date, near real-time.
API key · CSV
10k+/day
no machine-readable spec
NASA POWERFreeLive
Provides NASA satellite-derived solar radiation, temperature, and weather-model data by coordinate and date.
None · JSON
Unlimited
OpenAPI spec · llms.txt
National Weather ServiceFreeLive
Official US forecasts on a 2.5 km grid, active watches and warnings, and station observations, as GeoJSON.
None · JSON
Unlimited
OpenAPI spec
NOAA Climate Data OnlineFreeLive
Historical station observations and daily-to-yearly climate summaries from NOAA's archive, by station or area.
API key · JSON
10k+/day
no machine-readable spec
NOAA CO-OPS Tides & CurrentsLive
Tide predictions, observed water levels, currents and coastal weather from NOAA stations, back decades.
None · JSON
Unlimited
no machine-readable spec
OikolabPaidLive
Global hourly historical (from 1940) and forecast weather data by location, billed per data unit.
API key · JSON
—
no machine-readable spec
Open-MeteoFreemiumLive
Hourly and daily forecasts up to 16 days built from national weather-service models, callable without a key.
None · JSON
10k+/day
no machine-readable spec
Open-Meteo Ensemble APIFreemiumLive
Per-member probabilistic forecasts (18-51 ensemble runs) from ICON, GFS, ECMWF and other models.
None · JSON
10k+/day
no machine-readable spec
Open-Meteo Marine Weather APIFreemiumLive
Hourly wave height, swell, sea temperature, ocean currents and tide-inclusive sea level forecasts, no key.
None · JSON
10k+/day
no machine-readable spec
OpenAQFreemiumLive
Aggregated PM2.5, NO2, O3 and other pollutant readings from ground monitoring stations worldwide.
API key · JSON
10k+/day
no machine-readable spec
openSenseMapLive
Live readings from crowdsourced senseBox weather/air-quality stations worldwide.
None · JSON
Unlimited
no machine-readable spec
OpenUVLive
Real-time and hourly UV index forecasts by latitude/longitude, with altitude and ozone adjustments.
API key · JSON
—
OpenAPI spec
OpenWeatherFreemiumLive
Current conditions, 5-day forecasts, air pollution and map layers for any coordinates, plus geocoding.
API key · JSON
10k+/day
MCP server · llms.txt
PurpleAirFree trialLive
Live and historical PM2.5, temperature and humidity from community sensors, by sensor or bounding box.
API key · JSON
—
no machine-readable spec
PVGISLive
Solar radiation and photovoltaic system output estimates for any location, from the EU's PVGIS model.
None · JSON
Unlimited
no machine-readable spec
QWeatherFreemiumDown
Global real-time weather, forecasts, air quality, and severe alerts at 1km resolution.
API key · JSON
1k–10k/day
no machine-readable spec
Rainbow WeatherFreemiumLive
Minute-by-minute precipitation nowcasting, cloud/precip map tiles, and hourly/daily forecasts.
API key · JSON
100–1k/day
no machine-readable spec
RainViewerFreeLive
Animated precipitation radar map tiles and forecast overlays from 1,200+ radar stations worldwide.
None · JSON
—
llms.txt
SmartatestFreeLive
Swedish calculators for lighting lumens, appliance electricity cost, and barcode country prefixes.
None · JSON
10k+/day
OpenAPI spec · llms.txt
SolematicaFreemiumLive
Estimates solar panel production, ROI and cost for Italian roofs using satellite and irradiance data.
API key · JSON
—
llms.txt
Storm GlassFreemiumLive
Marine and weather forecasts (waves, tides, wind, temperature) blended from multiple national models.
API key · JSON
<100/day
OpenAPI spec
Strømpriser i dagFreeLive
Hourly Norwegian electricity spot prices per zone, including VAT and government support amounts.
None · JSON
100–1k/day
no machine-readable spec
Sunrise SunsetFreeLive
Sunrise, sunset, twilight, golden hour, sun position and moon phase for any coordinates, a year per call.
None · JSON
Unlimited
llms.txt
SunriseSunset.ioFreeLive
Sunrise, sunset, twilight, golden and blue hour, moonrise and moon phase for any coordinates and date range.
None · JSON
Unlimited
OpenAPI spec
SustainMetricsFreemiumLive
18,000+ GHG emission factors from DEFRA, EPA, ADEME and Ember for Scope 1-3 carbon footprint calculations.
API key · JSON
<100/day
no machine-readable spec
Tomorrow.ioFreemiumLive
Realtime conditions plus hourly (120h) and 5-day forecasts from proprietary models, with 60+ data layers.
API key · JSON
—
llms.txt
UK Carbon Intensity APILive
Half-hourly forecast and actual carbon intensity of Great Britain's electricity grid, national and regional.
None · JSON
Unlimited
no machine-readable spec
USGS Earthquake CatalogFreeLive
Searchable global earthquake catalog by time, area, depth and magnitude, plus minute-updated GeoJSON feeds.
None · JSON
Unlimited
no machine-readable spec
USGS Water ServicesFreeLive
Real-time and historical streamflow, gage height, and water-quality readings from US stations.
None · JSON
Unlimited
no machine-readable spec
USNO Astronomical Applications APILive
Moon phase dates, daily sun and moon rise/set, eclipses, seasons, Julian dates and sidereal time from USNO.
None · JSON
Unlimited
no machine-readable spec
Visual CrossingFreemiumLive
Historical weather back 50+ years and 15-day forecasts for any address or coordinate in one timeline query.
API key · JSON
1k–10k/day
OpenAPI spec · llms.txt
WattBuyLive
Electricity usage, utility, carbon footprint, and solar estimates for a US/Canada address.
API key · JSON
—
OpenAPI spec
WeatherAPIFreemiumLive
Current weather, 14-day forecasts, history from 2010, alerts, marine, astronomy and IP lookup.
API key · JSON
1k–10k/day
OpenAPI spec
WeatherbitFreemiumLive
Current conditions, 16-day and hourly forecasts, air quality, lightning, alerts and ag/energy degree-day data.
API key · JSON
<100/day
OpenAPI spec
WeatherstackFreemiumLive
Real-time weather lookup by city or coordinates, plus historical, forecast, and astronomy data on paid plans.
API key · JSON
<100/day
no machine-readable spec
WeatherTotalsFreeLive
US snow, rain and hail totals plus current aurora visibility, sourced from NOAA and NWS observations.
None · JSON
10k+/day
no machine-readable spec
Website Carbon APIFreeLive
Estimates a webpage's CO2 emissions and carbon rating from its transfer size and hosting type.
None · JSON
Unlimited
no machine-readable spec
WFIGS (NIFC) wildfire incidentsFreeLive
Current U.S. wildfire incidents: name, location, size, containment and cause, refreshed every 5 minutes.
None · JSON
Unlimited
no machine-readable spec
WorldTidesPaidLive
High and low tide times, tide heights and datums for any coastal coordinate, from harmonic station data.
API key · JSON
—
no machine-readable spec
wttr.inFreeLive
Current conditions and 3-day forecast by city, airport code or coordinates as text, PNG or JSON.
None · JSON
Unlimited
no machine-readable spec
Xweather Weather API (formerly AerisWeather)FreemiumLive
Observations, forecasts, alerts, lightning, hail and air quality by place name or coordinate, plus map tiles.
API key · JSON
100–1k/day
no machine-readable spec
Yandex Weather APIFree trialLive
Global current conditions, hourly/10-day forecasts and history via Yandex's Meteum GraphQL API.
API key · JSON
—
no machine-readable spec
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Choosing a Weather & Environment API
Is there a free Weather & Environment API?
Yes. National Weather Service, 7Timer!, AEMET OpenData, AirNow, AQICN (World Air Quality Index) and 38 others are free to use, and Open-Meteo, OpenWeather, 1ClickImpact, AccuWeather, Carbon Interface and 26 others have a free tier alongside paid plans. See all free Weather APIs.
Which Weather & Environment APIs work without an API key?
Open-Meteo, National Weather Service, 7Timer!, AviationWeather (NOAA Aviation Weather Center), Bright Sky and 37 others need no key or sign-up, so you can try them with a plain request.
Can I call a Weather & Environment API from front-end JavaScript?
Open-Meteo, National Weather Service, Bright Sky, Canadian Wildland Fire Information System, CycleCalcs and 32 others allow cross-origin requests and need no key, so they work straight from the browser. For the others, call them from your server so your key stays private.
Can I use Weather & Environment APIs in a commercial project?
OpenWeather, National Weather Service, 1ClickImpact, Bright Sky, Copernicus Climate Data Store and 31 others permit commercial use. Open-Meteo, 7Timer!, AQICN (World Air Quality Index), EMSC Seismic Portal FDSN, Foreca Weather API and 12 others restrict it, for example to non-commercial or attributed use, so read the terms first.
Which Weather & Environment APIs work with AI agents?
Moonlora has both an MCP server and an OpenAPI spec. OpenWeather, CycleCalcs and GribStream have an MCP server, so an AI agent can call them directly. National Weather Service, Bright Sky, Copernicus Climate Data Store, EMSC Seismic Portal FDSN, Energi Data Service and 19 others publish an OpenAPI spec for generating clients and tools.
Browse by subcategory: Weather Forecasts APIs · Air Quality APIs · Climate & Carbon APIs · Astronomy APIs · Natural Disasters APIs · Energy APIs
Popular topics: Historical Weather APIs · Marine Weather APIs · Weather Alerts APIs · Weather Radar APIs · Carbon Emissions APIs · Sunrise & Sunset APIs · Moon Phase APIs · Earthquakes APIs · Wildfires APIs · Electricity Prices APIs · Solar Energy APIs