Open-Meteo is an open-source weather API and offers free access for non-commercial use. No API key is required. You can use it immediately!
$ curl "https://api.open-meteo.com/v1/forecast?latitude=52.52&longitude=13.41&hourly=temperature_2m,relativehumidity_2m,windspeed_10m"
{
"latitude":52.52,
"longitude":13.419998,
"elevation":44.8125,
"hourly": {
"time":["2022-07-01T00:00","2022-07-01T01:00", ...]
"windspeed_10m":[3.16,3.02,3.3,3.14,3.2,2.95, ...],
"temperature_2m":[13.7,13.3,12.8,12.3,11.8, ...],
"relativehumidity_2m":[82,83,86,85,88,88,84,76, ...],
}
}Open-Meteo collaborates with National Weather Services providing Open Data with 2 to 11 km resolution. Our high performance APIs select the best weather model for your location and provide data as a simple JSON API.
APIs are free without any API key for open-source developers and non-commercial use. You can embed them directly into your app.