Free Weather APIs
Every API here is free outright or has a free tier. Limits differ a lot, so check the free tier column before you build on one.
| 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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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
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
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
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
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
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
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
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
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
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
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
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
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