Free Weather APIs
Forecasts, climate history and severe-weather feeds — checked around the clock. 31 of 37 on our probe schedule.
37In catalog37Probed by us31Healthy now0Degraded / dying274msMedian P50100.0%Median uptime · 30d
Website CarbonWeatherEstimate a web page's CO2 footprint from its byte weightHEALTHYauth noneWeatherHEALTHY100%47 msnone10h agoSunrise-SunsetWeatherGolden hour, civil twilight and day length for any point.HEALTHYauth noneWeatherHEALTHY99.44%126 msnone8h agoStorm Glass Marine WeatherWeatherStorm Glass Marine Weather — free tier with API keyHEALTHYauth apiKeyWeatherHEALTHY100%147 msapiKey3h agoUS WeatherWeatherOfficial US forecasts, alerts and observations from the NWSHEALTHYauth noneWeatherHEALTHY100%163 msnone12h agoGroundhog Day APIWeatherGroundhog Day API — This API returns all of North America’s prognosticating…HEALTHYauth noneWeatherHEALTHY100%217 msnone6h agoWeatherstackWeatherWeatherstack — free tier with API keyHEALTHYauth apiKeyWeatherHEALTHY100%200 msapiKey4h agoSolematicaWeatherCompare Italian rooftop-solar installer offers in one callHEALTHYauth noneWeatherHEALTHY100%202 msnone10h agoFree UV Index APIWeatherFree UV Index API — Provides real-time UV Index and 5 day Hourly UV Index F…HEALTHYauth noneWeatherHEALTHY99.44%194 msnone7h agoWeatherbit - Interactive Swagger UI DocumentationWeatherWeatherbit - Interactive Swagger UI Documentation — This an interactive versioHEALTHYauth noneWeatherHEALTHY100%114 msnone6h agoNational Grid ESOWeatherGreat Britain's electricity system operator open data, CKAN-styleHEALTHYauth noneWeatherHEALTHY100%123 msnone8h agoRainViewerWeatherGlobal weather-radar tile timestamps and map metadataHEALTHYauth noneWeatherHEALTHY100%335 msnone9h agoMeteorologisk InstituttWeatherNorwegian Met Institute global forecasts, free with attributionHEALTHYauth noneWeatherHEALTHY100%374 msnone9h agoOpen-MeteoWeatherHourly forecasts for any coordinate — no key, no signup.HEALTHYauth noneWeatherHEALTHY96.6%274 msnone36 min agoLuchtmeetnetWeatherDutch air-quality readings and forecasts from RIVM stationsHEALTHYauth noneWeatherHEALTHY100%499 msnone10h agoAare.guru APIWeatherAare.guru API — Aare.guru API — auto-discovered JSON endpointHEALTHYauth noneWeatherHEALTHY100%233 msnone7h ago7Timer!WeatherNumeric weather forecast for any lat/lonHEALTHYauth noneWeatherHEALTHY100%499 msnone7h agowttr.inWeatherWeather as JSON (or ASCII art) for any place on EarthHEALTHYauth noneWeatherHEALTHY96.6%392 msnone12h agoDanish data service EnergiWeatherLive Danish grid prices and emissions, straight from EnerginetHEALTHYauth noneWeatherHEALTHY100%474 msnone10h agoGlax Weather APIWeatherGlax Weather API — This API provides current weather data for a specified …HEALTHYauth noneWeatherHEALTHY100%458 msnone7h agoAutomatic Weather StationsWeatherAutomatic Weather Stations — The Automatic Weather Stations API provides accesHEALTHYauth noneWeatherHEALTHY100%418 msnone6h agoPM2.5 Open Data PortalWeatherCrowd-sourced low-cost PM2.5 sensor readings, refreshed liveHEALTHYauth noneWeatherHEALTHY100%887 msnone10h agoopenSenseMapWeatherLive readings from citizen-run senseBox weather stationsHEALTHYauth noneWeatherHEALTHY89.3%395 msnone12h agoTHC Open Mindfulness Resources APIWeatherMindfulness for Children & SchoolsHEALTHYauth noneWeatherHEALTHY100%1596 msnone4h agoBright Sky (DWD)WeatherOpen weather API built on German Weather Service (DWD) data covering all of GermHEALTHYauth noneWeatherHEALTHY99.44%244 msnone3h agoUK Carbon IntensityWeatherHow clean is Britain's grid right now? Ask National GridHEALTHYauth noneWeatherHEALTHY100%515 msnone10h agoAviationWeatherWeatherNOAA METARs, TAFs, and PIREPs in machine-readable JSONHEALTHYauth noneWeatherHEALTHY94.4%230 msnone9h agoIPMAWeatherPortugal's official city weather forecasts as JSONHEALTHYauth noneWeatherHEALTHY98.9%401 msnone9h agoHong Kong ObservatoryWeatherHong Kong weather, warnings, and climate open dataHEALTHYauth noneWeatherHEALTHY98.9%1678 msnone9h agoGrünstromIndexWeatherHourly green-power forecast for German postcodesHEALTHYauth noneWeatherHEALTHY74.7%1101 msnone9h agoNDBC Buoy Data APIWeatherNDBC Buoy Data API — Description: Access real-time buoy readings and informa…DEADauth noneWeatherDEAD32.2%576 msnone7h agoOpen-Meteo ArchiveWeatherHistorical weather reanalysis by coordinateDEADauth noneWeatherDEAD0.0%—none5h agoColorfulCloudsWeatherColorfulClouds — free tier with API keyDEADauth apiKeyWeatherDEAD0.0%—apiKey13h agoClimate FieldView Platform APIsWeatherClimate FieldView Platform APIs — free tier with API keyDEADauth apiKeyWeatherDEAD0.0%—apiKey36 min agoDigitalOcean Spaces APIWeatherDigitalOcean Spaces API — free tier with API keyDEADauth apiKeyWeatherDEAD0.0%—apiKey36 min agoDFlight APIWeatherDFlight API — keyless JSON APIDEADauth noneWeatherDEAD23.0%182 msnone12h agoAQICNWeatherAQICN — free tier with API keyREACHABLEauth apiKeyWeatherREACHABLE100%267 msapiKey4h agoWeather Underground APIWeatherWeather Underground API — free-tier JSON endpointREACHABLEauth apiKeyWeatherREACHABLE100%61 msapiKey6 min ago
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Free Weather APIs — FAQ
Are there free Weather APIs with no API key?
Yes — 30 of the 37 free weather APIs we list need no API key or signup (Website Carbon 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 37 weather APIs on our probe schedule, Website Carbon leads on measured uptime (100% 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?
24 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 37 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?
31 of the 37 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.