Open-Meteo
Open-source weather forecasts and historical data with no key required for non-commercial use.
Authentication
No API key is needed for basic use, which makes it ideal for prototypes, but respect the provider's fair-use policy and cache results where allowed.
Pricing model
A free tier is available for getting started, with paid plans for higher limits or commercial features. Confirm whether the free tier allows commercial use. Prices change often, so check the provider's pricing page before you commit, and model your bill at 10× today's volume.
Before you integrate
- Read the terms on caching, storing and displaying data.
- Note the rate limits and the error format so you can retry with backoff.
- Wrap calls behind your own interface so you can switch providers later.
- Pin an API version if the provider offers versioning, and watch its changelog.
Alternatives to Open-Meteo
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.