Last time I read the API documents, they were only in Norwegian for this purpose.
Edit: it seems this is no longer the case; at least I can't find it on the site. But my Norwegian skills are practically non-existant.
This data is provided by the Norwegian meteorological institute: https://www.met.no/en/free-meteorological-data
There is also a private Norwegian weather provider, StormGeo: https://www.stormgeo.com/
Last time I read the API documents, they were only in Norwegian for this purpose.
Edit: it seems this is no longer the case; at least I can't find it on the site. But my Norwegian skills are practically non-existant.