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 / dying605msMedian P50100.0%Median uptime · 30d
Website CarbonWeatherEstimate a web page's CO2 footprint from its byte weightHEALTHYauth noneWeatherHEALTHY100%38 msnone6h agoGroundhog Day APIWeatherGroundhog Day API — This API returns all of North America’s prognosticating…HEALTHYauth noneWeatherHEALTHY100%262 msnone2h agoStorm Glass Marine WeatherWeatherStorm Glass Marine Weather — free tier with API keyHEALTHYauth apiKeyWeatherHEALTHY100%238 msapiKey37 min agoSunrise-SunsetWeatherGolden hour, civil twilight and day length for any point.HEALTHYauth noneWeatherHEALTHY99.02%204 msnone2h agoUS WeatherWeatherOfficial US forecasts, alerts and observations from the NWSHEALTHYauth noneWeatherHEALTHY100%223 msnone7h agoSolematicaWeatherCompare Italian rooftop-solar installer offers in one callHEALTHYauth noneWeatherHEALTHY100%267 msnone6h agoWeatherstackWeatherWeatherstack — free tier with API keyHEALTHYauth apiKeyWeatherHEALTHY100%309 msapiKey52 min agoFree UV Index APIWeatherFree UV Index API — Provides real-time UV Index and 5 day Hourly UV Index F…HEALTHYauth noneWeatherHEALTHY99.02%284 msnone3h agoRainViewerWeatherGlobal weather-radar tile timestamps and map metadataHEALTHYauth noneWeatherHEALTHY100%551 msnone5h agoWeatherbit - Interactive Swagger UI DocumentationWeatherWeatherbit - Interactive Swagger UI Documentation — This an interactive versioHEALTHYauth noneWeatherHEALTHY100%529 msnone2h agoMeteorologisk InstituttWeatherNorwegian Met Institute global forecasts, free with attributionHEALTHYauth noneWeatherHEALTHY100%621 msnone5h agoNational Grid ESOWeatherGreat Britain's electricity system operator open data, CKAN-styleHEALTHYauth noneWeatherHEALTHY100%609 msnone4h agoPM2.5 Open Data PortalWeatherCrowd-sourced low-cost PM2.5 sensor readings, refreshed liveHEALTHYauth noneWeatherHEALTHY100%796 msnone6h ago7Timer!WeatherNumeric weather forecast for any lat/lonHEALTHYauth noneWeatherHEALTHY100%600 msnone2h agoOpen-MeteoWeatherHourly forecasts for any coordinate — no key, no signup.HEALTHYauth noneWeatherHEALTHY95.1%673 msnone7h agoLuchtmeetnetWeatherDutch air-quality readings and forecasts from RIVM stationsHEALTHYauth noneWeatherHEALTHY100%806 msnone6h agoAare.guru APIWeatherAare.guru API — Aare.guru API — auto-discovered JSON endpointHEALTHYauth noneWeatherHEALTHY100%1025 msnone2h agoDanish data service EnergiWeatherLive Danish grid prices and emissions, straight from EnerginetHEALTHYauth noneWeatherHEALTHY100%888 msnone6h agoGlax Weather APIWeatherGlax Weather API — This API provides current weather data for a specified …HEALTHYauth noneWeatherHEALTHY100%1004 msnone3h agoAutomatic Weather StationsWeatherAutomatic Weather Stations — The Automatic Weather Stations API provides accesHEALTHYauth noneWeatherHEALTHY100%986 msnone2h agowttr.inWeatherWeather as JSON (or ASCII art) for any place on EarthHEALTHYauth noneWeatherHEALTHY95.1%700 msnone7h agoopenSenseMapWeatherLive readings from citizen-run senseBox weather stationsHEALTHYauth noneWeatherHEALTHY90.2%655 msnone7h agoNDBC Buoy Data APIWeatherNDBC Buoy Data API — Description: Access real-time buoy readings and informa…auth noneWeather84.3%575 msnone2h agoBright Sky (DWD)WeatherOpen weather API built on German Weather Service (DWD) data covering all of GermHEALTHYauth noneWeatherHEALTHY99.02%656 msnone7 min agoUK Carbon IntensityWeatherHow clean is Britain's grid right now? Ask National GridHEALTHYauth noneWeatherHEALTHY100%789 msnone6h agoAviationWeatherWeatherNOAA METARs, TAFs, and PIREPs in machine-readable JSONHEALTHYauth noneWeatherHEALTHY93.1%450 msnone5h agoIPMAWeatherPortugal's official city weather forecasts as JSONHEALTHYauth noneWeatherHEALTHY98.0%1024 msnone5h agoHong Kong ObservatoryWeatherHong Kong weather, warnings, and climate open dataHEALTHYauth noneWeatherHEALTHY100%1415 msnone5h agoGrünstromIndexWeatherHourly green-power forecast for German postcodesHEALTHYauth noneWeatherHEALTHY73.5%1072 msnone10h agoOpen-Meteo ArchiveWeatherHistorical weather reanalysis by coordinateDEADauth noneWeatherDEAD0.0%—none1h agoColorfulCloudsWeatherColorfulClouds — free tier with API keyDEADauth apiKeyWeatherDEAD0.0%—apiKey9h agoClimate FieldView Platform APIsWeatherClimate FieldView Platform APIs — free tier with API keyDEADauth apiKeyWeatherDEAD0.0%—apiKey10h agoDigitalOcean Spaces APIWeatherDigitalOcean Spaces API — free tier with API keyDEADauth apiKeyWeatherDEAD0.0%—apiKey10h agoDFlight APIWeatherDFlight API — keyless JSON APIDEADauth noneWeatherDEAD11.8%319 msnone10h agoAQICNWeatherAQICN — free tier with API keyREACHABLEauth apiKeyWeatherREACHABLE100%224 msapiKey52 min agoWeather Underground APIWeatherWeather Underground API — free-tier JSON endpointREACHABLEauth apiKeyWeatherREACHABLE100%104 msapiKey10h 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.