Free Weather APIs
Forecasts, climate history and severe-weather feeds — checked around the clock. 31 of 36 on our probe schedule.
36In catalog36Probed by us30Healthy now1Degraded / dying576msMedian P50100.0%Median uptime · 30d
Website CarbonWeatherEstimate a web page's CO2 footprint from its byte weightHEALTHYauth noneWeatherHEALTHY100%38 msnone11h agoGroundhog Day APIWeatherGroundhog Day API — This API returns all of North America’s prognosticating…HEALTHYauth noneWeatherHEALTHY100%258 msnone7h agoStorm Glass Marine WeatherWeatherStorm Glass Marine Weather — free tier with API keyHEALTHYauth apiKeyWeatherHEALTHY100%235 msapiKey6h agoSunrise-SunsetWeatherGolden hour, civil twilight and day length for any point.HEALTHYauth noneWeatherHEALTHY99.04%196 msnone8h agoUS WeatherWeatherOfficial US forecasts, alerts and observations from the NWSHEALTHYauth noneWeatherHEALTHY100%205 msnone12h agoSolematicaWeatherCompare Italian rooftop-solar installer offers in one callHEALTHYauth noneWeatherHEALTHY100%268 msnone11h agoWeatherstackWeatherWeatherstack — free tier with API keyHEALTHYauth apiKeyWeatherHEALTHY100%304 msapiKey6h agoFree UV Index APIWeatherFree UV Index API — Provides real-time UV Index and 5 day Hourly UV Index F…HEALTHYauth noneWeatherHEALTHY99.04%277 msnone8h agoWeatherbit - Interactive Swagger UI DocumentationWeatherWeatherbit - Interactive Swagger UI Documentation — This an interactive versioHEALTHYauth noneWeatherHEALTHY100%518 msnone7h agoRainViewerWeatherGlobal weather-radar tile timestamps and map metadataHEALTHYauth noneWeatherHEALTHY100%540 msnone10h agoMeteorologisk InstituttWeatherNorwegian Met Institute global forecasts, free with attributionHEALTHYauth noneWeatherHEALTHY100%628 msnone10h agoNational Grid ESOWeatherGreat Britain's electricity system operator open data, CKAN-styleHEALTHYauth noneWeatherHEALTHY100%568 msnone9h agoPM2.5 Open Data PortalWeatherCrowd-sourced low-cost PM2.5 sensor readings, refreshed liveHEALTHYauth noneWeatherHEALTHY100%796 msnone11h ago7Timer!WeatherNumeric weather forecast for any lat/lonHEALTHYauth noneWeatherHEALTHY100%577 msnone8h agoOpen-MeteoWeatherHourly forecasts for any coordinate — no key, no signup.HEALTHYauth noneWeatherHEALTHY95.2%673 msnone43 min agoLuchtmeetnetWeatherDutch air-quality readings and forecasts from RIVM stationsHEALTHYauth noneWeatherHEALTHY100%787 msnone11h agoAare.guru APIWeatherAare.guru API — Aare.guru API — auto-discovered JSON endpointHEALTHYauth noneWeatherHEALTHY100%1021 msnone8h agoDanish data service EnergiWeatherLive Danish grid prices and emissions, straight from EnerginetHEALTHYauth noneWeatherHEALTHY100%798 msnone11h agoGlax Weather APIWeatherGlax Weather API — This API provides current weather data for a specified …HEALTHYauth noneWeatherHEALTHY100%985 msnone8h agoAutomatic Weather StationsWeatherAutomatic Weather Stations — The Automatic Weather Stations API provides accesHEALTHYauth noneWeatherHEALTHY100%986 msnone7h agowttr.inWeatherWeather as JSON (or ASCII art) for any place on EarthHEALTHYauth noneWeatherHEALTHY95.2%694 msnone12h agoopenSenseMapWeatherLive readings from citizen-run senseBox weather stationsHEALTHYauth noneWeatherHEALTHY90.4%670 msnone12h agoNDBC Buoy Data APIWeatherNDBC Buoy Data API — Description: Access real-time buoy readings and informa…auth noneWeather82.7%575 msnone8h agoBright Sky (DWD)WeatherOpen weather API built on German Weather Service (DWD) data covering all of GermHEALTHYauth noneWeatherHEALTHY99.04%653 msnone5h agoUK Carbon IntensityWeatherHow clean is Britain's grid right now? Ask National GridHEALTHYauth noneWeatherHEALTHY100%765 msnone11h agoAviationWeatherWeatherNOAA METARs, TAFs, and PIREPs in machine-readable JSONHEALTHYauth noneWeatherHEALTHY93.3%415 msnone10h agoIPMAWeatherPortugal's official city weather forecasts as JSONHEALTHYauth noneWeatherHEALTHY98.1%1024 msnone10h agoHong Kong ObservatoryWeatherHong Kong weather, warnings, and climate open dataHEALTHYauth noneWeatherHEALTHY100%1419 msnone10h agoGrünstromIndexWeatherHourly green-power forecast for German postcodesHEALTHYauth noneWeatherHEALTHY74.0%1063 msnone3h agoOpen-Meteo ArchiveWeatherHistorical weather reanalysis by coordinateDEADauth noneWeatherDEAD0.0%—none7h agoColorfulCloudsWeatherColorfulClouds — free tier with API keyDEADauth apiKeyWeatherDEAD0.0%—apiKey10h agoClimate FieldView Platform APIsWeatherClimate FieldView Platform APIs — free tier with API keyDEADauth apiKeyWeatherDEAD0.0%—apiKey3h agoDigitalOcean Spaces APIWeatherDigitalOcean Spaces API — free tier with API keyDEADauth apiKeyWeatherDEAD0.0%—apiKey3h agoDFlight APIWeatherDFlight API — keyless JSON APIDEADauth noneWeatherDEAD11.5%319 msnone3h agoAQICNWeatherAQICN — free tier with API keyREACHABLEauth apiKeyWeatherREACHABLE100%224 msapiKey6h agoWeather Underground APIWeatherWeather Underground API — free-tier JSON endpointREACHABLEauth apiKeyWeatherREACHABLE100%99 msapiKey3h ago
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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 (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 36 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?
22 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?
31 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.