Free Weather APIs
Forecasts, climate history and severe-weather feeds — checked around the clock. 36 of 36 on our probe schedule · 11 probed.
36In catalog11Probed by us1Healthy now0Degraded / dying—Median P50NaN%Median uptime · 30d
Open-MeteoWeatherHourly forecasts for any coordinate — no key, no signup.HEALTHYauth noneWeatherHEALTHY—%—none2h agoSunrise-SunsetWeatherGolden hour, civil twilight and day length for any point.NEWauth noneWeatherNEW—%—none2h agoUS WeatherWeatherOfficial US forecasts, alerts and observations from the NWSUNMONITOREDauth noneWeatherUNMONITORED—%—none58 min agowttr.inWeatherWeather as JSON (or ASCII art) for any place on EarthUNMONITOREDauth noneWeatherUNMONITORED—%—none58 min agoopenSenseMapWeatherLive readings from citizen-run senseBox weather stationsUNMONITOREDauth noneWeatherUNMONITORED—%—none58 min agoDanish data service EnergiWeatherLive Danish grid prices and emissions, straight from EnerginetUNMONITOREDauth noneWeatherUNMONITORED—%—none42 min agoLuchtmeetnetWeatherDutch air-quality readings and forecasts from RIVM stationsUNMONITOREDauth noneWeatherUNMONITORED—%—none42 min agoPM2.5 Open Data PortalWeatherCrowd-sourced low-cost PM2.5 sensor readings, refreshed liveUNMONITOREDauth noneWeatherUNMONITORED—%—none42 min agoSolematicaWeatherCompare Italian rooftop-solar installer offers in one callUNMONITOREDauth noneWeatherUNMONITORED—%—none42 min agoUK Carbon IntensityWeatherHow clean is Britain's grid right now? Ask National GridUNMONITOREDauth noneWeatherUNMONITORED—%—none42 min agoWebsite CarbonWeatherEstimate a web page's CO2 footprint from its byte weightUNMONITOREDauth noneWeatherUNMONITORED—%—none42 min agoAviationWeatherWeatherNOAA METARs, TAFs, and PIREPs in machine-readable JSONUNMONITOREDauth noneWeatherUNMONITORED—%—nonejust nowHong Kong ObservatoryWeatherHong Kong weather, warnings, and climate open dataUNMONITOREDauth noneWeatherUNMONITORED—%—nonejust nowIPMAWeatherPortugal's official city weather forecasts as JSONUNMONITOREDauth noneWeatherUNMONITORED—%—nonejust nowRainViewerWeatherGlobal weather-radar tile timestamps and map metadataUNMONITOREDauth noneWeatherUNMONITORED—%—nonejust nowMeteorologisk InstituttWeatherNorwegian Met Institute global forecasts, free with attributionUNMONITOREDauth noneWeatherUNMONITORED—%—nonejust nowNational Grid ESOWeatherGreat Britain's electricity system operator open data, CKAN-styleUNMONITOREDauth noneWeatherUNMONITORED—%—nonejust nowGrünstromIndexWeatherHourly green-power forecast for German postcodesUNMONITOREDauth noneWeatherUNMONITORED—%—nonejust nowFree UV Index APIWeatherFree UV Index API — Provides real-time UV Index and 5 day Hourly UV Index F…UNMONITOREDauth noneWeatherUNMONITORED—%—nonejust nowGlax Weather APIWeatherGlax Weather API — This API provides current weather data for a specified …UNMONITOREDauth noneWeatherUNMONITORED—%—nonejust nowNDBC Buoy Data APIWeatherNDBC Buoy Data API — Description: Access real-time buoy readings and informa…UNMONITOREDauth noneWeatherUNMONITORED—%—nonejust nowAare.guru APIWeatherAare.guru API — Aare.guru API — auto-discovered JSON endpointUNMONITOREDauth noneWeatherUNMONITORED—%—nonejust now7Timer!WeatherNumeric weather forecast for any lat/lonUNMONITOREDauth noneWeatherUNMONITORED—%—nonejust nowGroundhog Day APIWeatherGroundhog Day API — This API returns all of North America’s prognosticating…UNMONITOREDauth noneWeatherUNMONITORED—%—nonejust nowWeatherbit - Interactive Swagger UI DocumentationWeatherWeatherbit - Interactive Swagger UI Documentation — This an interactive versioUNMONITOREDauth noneWeatherUNMONITORED—%—nonejust nowAutomatic Weather StationsWeatherAutomatic Weather Stations — The Automatic Weather Stations API provides accesUNMONITOREDauth noneWeatherUNMONITORED—%—nonejust nowOpen-Meteo ArchiveWeatherHistorical weather reanalysis by coordinateUNMONITOREDauth noneWeatherUNMONITORED—%—nonejust nowWeatherstackWeatherWeatherstack — free tier with API keyUNMONITOREDauth apiKeyWeatherUNMONITORED—%—apiKeyjust nowAQICNWeatherAQICN — free tier with API keyON SCHEDULEauth apiKeyWeatherON SCHEDULE—%—apiKeyjust nowStorm Glass Marine WeatherWeatherStorm Glass Marine Weather — free tier with API keyUNMONITOREDauth apiKeyWeatherUNMONITORED—%—apiKeyjust nowBright Sky (DWD)WeatherOpen weather API built on German Weather Service (DWD) data covering all of GermUNMONITOREDauth noneWeatherUNMONITORED—%—nonejust nowColorfulCloudsWeatherColorfulClouds — free tier with API keyON SCHEDULEauth apiKeyWeatherON SCHEDULE—%—apiKeyjust nowClimate FieldView Platform APIsWeatherClimate FieldView Platform APIs — free tier with API keyUNMONITOREDauth apiKeyWeatherUNMONITORED—%—apiKeyjust nowDigitalOcean Spaces APIWeatherDigitalOcean Spaces API — free tier with API keyUNMONITOREDauth apiKeyWeatherUNMONITORED—%—apiKeyjust nowWeather Underground APIWeatherWeather Underground API — free-tier JSON endpointON SCHEDULEauth apiKeyWeatherON SCHEDULE—%—apiKeyjust nowDFlight APIWeatherDFlight API — keyless JSON APIUNMONITOREDauth noneWeatherUNMONITORED—%—nonejust now
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Free Weather APIs — FAQ
Are there free Weather APIs with no API key?
Yes — 29 of the 36 free weather APIs we list need no API key or signup (Open-Meteo is a good starting point). Use the "No key" filter above to see them; they're the fastest to prototype with.
Which free Weather API is the most reliable?
Of the 11 weather APIs on our probe schedule, Open-Meteo leads on measured uptime (—% over 90 days). Reliability here is verified from our own scheduled checks, not the provider's claims — sort by "Reliable" to rank the rest.
Can I call these Weather APIs from the browser?
23 of these weather APIs send CORS headers over HTTPS, so you can fetch them straight from front-end code — no backend proxy. Filter by "Browser OK" to see them; the rest need a server-side call.
Are these free Weather APIs OK for commercial use?
4 of the 36 weather APIs allow commercial use on the free tier; the rest are unclear or personal-only. We record service terms and the data license as separate fields on every listing — check both before you ship.
How often are these Weather APIs checked?
36 of the 36 weather APIs are on our probe schedule and re-tested every sweep. We log uptime, latency and response-shape changes on each, and move any that stay down to the graveyard so you can see what died and when.