Best Free Weather APIs (May 2026)
Ranked by uptime + speed + free-tier quality. Updated every hour.
- #1 Open-Meteo — 🟡 Unknown
Free weather forecast API with no key required. 10,000 calls/day for non-commercial use.
10,000 calls/day, no key, no credit card
- #2 7Timer! — 🟡 Unknown
Free, no-key weather forecast API focused on astronomical and civil forecasts using NOAA GFS model data.
Unlimited, no key, no credit card
- #3 Bright Sky (DWD) — 🟡 Unknown
Open weather API built on German Weather Service (DWD) data covering all of Germany with no key required.
Unlimited, no key, no credit card
- #4 NOAA National Weather Service — 🟡 Unknown
Official US government weather API providing forecasts, alerts, and observations for US locations. No key required.
Unlimited (US only), no key, no credit card
- #5 Open-Meteo Air Quality — 🟡 Unknown
Free air quality forecast API providing PM2.5, PM10, ozone, and other pollutant data worldwide. No key required.
10,000 calls/day, no key, no credit card
- #6 MET Norway Locationforecast — 🟡 Unknown
Free weather forecast API from the Norwegian Meteorological Institute covering global locations. No key required.
Unlimited, no key, must set User-Agent header
- #7 OpenWeatherMap — 🟡 Unknown
One of the most popular weather APIs with current, forecast, and historical data for any location worldwide.
1,000 calls/day, free key, no credit card
- #8 WeatherAPI.com — 🟡 Unknown
Comprehensive weather API offering current, forecast, historical, marine, and astronomy data with a generous free tier.
1,000,000 calls/month, free key, no credit card
- #9 Tomorrow.io — 🟡 Unknown
AI-powered weather API with hyperlocal forecasts, severe weather alerts, and climate intelligence for 25 locations free.
25 locations, 500 calls/day, free key, no CC
- #10 Visual Crossing Weather — 🟡 Unknown
Historical and forecast weather data API with CSV and JSON output, supporting 40+ years of history and 15-day forecasts.
1,000 records/day, free key, no credit card
- #11 Weatherbit — 🟡 Unknown
Global weather API offering current conditions, 16-day forecasts, hourly data, and severe weather alerts for 150+ countries.
500 calls/day, free key, no credit card
- #12 Weatherstack — 🟡 Unknown
Real-time and historical weather data API powered by worldwide weather stations with JSON and XML output.
100 calls/month, free key, no credit card
- #13 MeteoSource — 🟡 Unknown
High-resolution weather forecast API with hourly and daily data, machine-learning corrected models for 150,000+ locations.
400 calls/day, free key, no credit card
- #14 AccuWeather API — 🟡 Unknown
Industry-leading weather API with hyperlocal MinuteCast, severe weather alerts, and 45-day forecasts.
50 calls/day, free key, no credit card
- #15 OpenUV — 🟡 Unknown
Real-time and forecast UV index API covering global locations using NASA satellite data. Free tier available.
100 calls/day, free key, no credit card