Weather & Climate APIs
Forecasts, historical weather and alerts. 5 listed: 1 completely free, 2 usable without an API key.
Open-Meteo
Open-source weather forecasts and historical data with no key required for non-commercial use.
OpenWeather
Current weather, forecasts, air pollution and historical data.
National Weather Service API
Official US forecasts, alerts and observations from NOAA.
WeatherAPI.com
Forecasts, history, astronomy and time-zone data in one JSON API.
Tomorrow.io
Hyperlocal weather forecasts and weather-based alerts.
Comparing weather & climate APIs
| API | Auth | Pricing model | Docs |
|---|---|---|---|
| Open-Meteo | No key | Free tier | open-meteo.com |
| OpenWeather | API key | Free tier | openweathermap.org |
| National Weather Service API | No key | Free | weather.gov |
| WeatherAPI.com | API key | Free tier | weatherapi.com |
| Tomorrow.io | API key | Free tier | docs.tomorrow.io |
Not sure which to pick? Read our 12-point API checklist and guide to API pricing models.