All of the information presented via the API is intended to be open data, free to use for any purpose. As a public service of the United States Government, we do not charge any fees for the usage of this service, although there are reasonable rate limits in place to prevent abuse and help ensure that everyone has access.

I have tried the following endpoints:

https://api.weather.gov/stations?state=CA&limit=10

Gives a list of the stations

https://api.weather.gov/stations/KPAO

Has details for the KPAO station

https://api.weather.gov/stations/KPAO/observations

Has the weather observations.

It seems like github has a few repo accessing the API but the data look easy to parse anyway.

That would be an helpful addition to windy !