Openweathermap Api Key

Your API key works for all OpenWeatherMap APIs (Current, Forecast, Historical, etc.) as long as your plan includes them.

Without a valid API key, requests to OpenWeatherMap will fail (typically with a 401 Unauthorized error). openweathermap api key

Getting your API key is straightforward and, for many developers, completely free. Here are the steps to follow as of 2026: Your API key works for all OpenWeatherMap APIs

curl "http://api.openweathermap.org/data/2.5/air_pollution?lat=40.7128&lon=-74.0060&appid=YOUR_API_KEY" for many developers

Free tier – exceeding 1,000 calls/day results in a 429 error until the next UTC day.