Free Weather APIs — ranked by value

Forecasts, current conditions, climate

Scores rate free-tier value on a 1–10 scale. How scores work →

OpenWeatherMap Weather API key Ubiquitous global weather API covering current conditions, forecasts, historical archives, air quality, and map tiles via the One Call API. 1k req/daySDK
WeatherAPI.com Weather API key Developer-friendly weather API bundling forecast, history, astronomy, air quality, sports, and IP-based geolocation lookups. 1M req/moSDK
Open-Meteo Weather No auth Open-source weather API aggregating 30+ national models with no API key required and free noncom use plus historical data back to 1940. 10k/daySDK
Tomorrow.io Weather API key Hyperlocal weather intelligence API with 80+ data layers including minute-level precipitation, air quality, and proprietary maps. 500 req/daySDK
Visual Crossing Weather API key Timeline weather API with an unusually generous free tier covering forecast, current conditions, and deep global historical data. 1k/daySDK
National Weather Service API Weather No auth Free US government API for forecasts, alerts, and observations from the National Weather Service, no key required. 5 req/secOpenAPI
AccuWeather Weather API key Established commercial weather provider offering current conditions, forecasts, indices, and severe-weather alerts with a limited free developer tier. 50 req/daySDK
Apple WeatherKit Weather Token Apple's weather service (successor to Dark Sky) offering Swift and REST APIs for forecasts, alerts, and historical data, authenticated via signed JWTs. 500k/mo
Meteomatics Weather API key Enterprise weather API exposing over 1800 parameters worldwide with a free trial covering basic forecast and historical data. 500 req/daySDK
Weatherbit Weather API key Global weather API for current, forecast, and historical data plus air quality and severe alerts, with a free 50-calls-per-day plan. 50 req/daySDK
Meteostat Weather API key Open historical weather and climate API sourcing decades of station and gridded data, with a free 500-requests-per-month plan. 500 req/mo
Stormglass.io Weather API key Marine and weather API aggregating multiple meteorological and oceanographic sources, including tides and wave data, with a free tier. 10/daySDK
Weatherstack Weather API key Lightweight REST weather API for real-time, historical, and forecast data with a free-forever plan aimed at simple apps. 100/moSDK
meteoblue Weather API key Swiss high-resolution weather API offering 100+ variables, forecast, and historical data since 1940, with a free test product. Free (non-commercial)
Pirate Weather Weather API key Open-source drop-in replacement for the Dark Sky API serving GFS, HRRR, and NBM forecasts as JSON with a free tier. 10k/mo
MET Norway Locationforecast Weather No auth Free weather API from the Norwegian Meteorological Institute (powers Yr) offering global forecasts under a Creative Commons license, no key required. 20 req/sec
Met Office Weather DataHub Weather API key UK Met Office API delivering site-specific GeoJSON forecasts and atmospheric data, with a free site-specific tier. 360 req/dayOpenAPI
Bright Sky (DWD) Weather No auth Free open-source JSON API exposing Germany's DWD open weather data including current observations, forecasts, and radar, no key required. Self-hosted
Xweather (Vaisala / Aeris) Weather API key Vaisala's weather API (formerly AerisWeather) providing forecasts, alerts, lightning, and map layers with a free developer trial. Free developer trialSDK
Meteosource Weather API key Weather API blending AI and multiple models for hyperlocal forecasts, air quality, and historical data with a free plan. 400 req/day
Ambee Weather API key Environmental intelligence API covering high-resolution weather alongside air quality, pollen, fire, and soil data, with a free tier. Trial creditSDK
wttr.in Weather No auth Console-oriented weather service returning forecasts as ANSI art, plain text, or JSON straight from a URL with no key. 1 req/sec
7Timer! Weather No auth Free no-key weather API focused on astronomical seeing and civil forecasts derived from NOAA GFS model data. No published cap
Météo-France API Weather API key Official French meteorological service API offering forecasts, rain nowcasting, and weather warning bulletins with a free tier. 50 req/min
GribStream Weather API key Developer API serving NOAA NBM and GFS model forecasts optimized for fast bulk multi-point pulls without downloading GRIB files. Free tier
OpenUV Weather API key Real-time and forecast UV index API including safe-exposure and ozone data, with a free daily request allowance. 50/day
WeatherUnion (Zomato) Weather API key Free crowd-sourced weather API from Zomato's dense network of ground weather stations across Indian cities. Fair use
Foreca Weather API Weather Token Commercial global weather API offering current conditions, hourly and daily forecasts, and location autocomplete, with a free developer trial. Free developer/trial
NOAA Climate Data Online (CDO) Weather Token Free US government API serving NOAA's archive of daily, monthly, and normals climate records from global weather stations. 5 req/sec
Tides and Currents (NOAA CO-OPS) Weather No auth Free NOAA CO-OPS API for water levels, tide predictions, currents, and coastal meteorological observations, no key required. No published cap