Weather Forecasts APIs
Weather forecast APIs fall into two camps. National agencies publish free official data, such as the US National Weather Service with GeoJSON forecasts and warnings, MET Norway with point forecasts for any coordinate, and Météo-France behind OAuth. Commercial services like OpenWeather, WeatherAPI and Tomorrow.io add history, air quality or extra data layers behind a key with free tiers, while Open-Meteo builds forecasts from national models and needs no key. Free Weather APIs →
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
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 |
APIXUDiscontinued weather API; apixu.com now server-redirects permanently to Weatherstack. Weather & Environment › Weather Forecasts | — | Deprecated | |||
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 |
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 |
Dark SkyRetired minute-by-minute forecast service bought by Apple; its successor is the WeatherKit REST API. Weather & Environment › Weather Forecasts | — | Deprecated | |||
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 |
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 |
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 |
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 |
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 | |
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 |
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 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 |
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 |
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 |
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 |
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 |
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 |
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 |
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
APIXUDeprecated
Discontinued weather API; apixu.com now server-redirects permanently to Weatherstack.
·
—
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
ColorfulClouds Weather APIFreemiumDegraded
Global weather forecasts with minute-by-minute nowcasting and air-quality data by coordinates.
API key · JSON
—
no machine-readable spec
Dark SkyDeprecated
Retired minute-by-minute forecast service bought by Apple; its successor is the WeatherKit REST API.
·
—
no machine-readable 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
GribStreamFreemiumLive
Forecast, satellite/radar and historical weather data by coordinate, queried against GFS, HRRR and NBM models.
API key · JSON
—
MCP server
Grill IndexFreeLive
Scores backyard grilling conditions 0-100 from live weather, with best-window and weekly forecasts.
None · JSON
10k+/day
OpenAPI spec
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
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
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
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 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
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
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
Storm GlassFreemiumLive
Marine and weather forecasts (waves, tides, wind, temperature) blended from multiple national models.
API key · JSON
<100/day
OpenAPI spec
Tomorrow.ioFreemiumLive
Realtime conditions plus hourly (120h) and 5-day forecasts from proprietary models, with 60+ data layers.
API key · JSON
—
llms.txt
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
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 Forecasts API
Is there a free Weather Forecasts API?
Yes. AEMET OpenData, AviationWeather (NOAA Aviation Weather Center), Euskalmet, Grill Index, Hong Kong Observatory Open Data and 8 others are free to use, and Open-Meteo, OpenWeather, WeatherAPI, AccuWeather, ColorfulClouds Weather API and 14 others have a free tier alongside paid plans. See all free Weather APIs.
Which Weather Forecasts APIs work without an API key?
Open-Meteo, AviationWeather (NOAA Aviation Weather Center), Grill Index, Hong Kong Observatory Open Data, IPMA and 9 others need no key or sign-up, so you can try them with a plain request.
Can I call a Weather Forecasts API from front-end JavaScript?
Open-Meteo, Grill Index, Hong Kong Observatory Open Data, IPMA, MET Norway Locationforecast and 8 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 Forecasts APIs in a commercial project?
OpenWeather, WeatherAPI, Euskalmet, MET Norway Locationforecast, Meteorologisk Institutt and 8 others permit commercial use. Open-Meteo, Foreca Weather API, Grill Index, Hong Kong Observatory Open Data, Open-Meteo Ensemble API and 6 others restrict it, for example to non-commercial or attributed use, so read the terms first.
Which Weather Forecasts APIs work with AI agents?
OpenWeather and GribStream have an MCP server, so an AI agent can call them directly. WeatherAPI, Grill Index, MET Norway Locationforecast, Météo-France API Portal, Meteoblue and 6 others publish an OpenAPI spec for generating clients and tools.
More specific: Historical Weather APIs · Marine Weather APIs · Weather Alerts APIs · Weather Radar APIs
More in Weather & Environment: Air Quality APIs · Climate & Carbon APIs · Astronomy APIs · Natural Disasters APIs · Energy APIs