thanks for the replay, I changed the parameter to be hourlyStart and hourlyEnd now and it works. Weird the dailyStart and dailyEnd param was giving me the same result couple weeks back.

no one has reached out to me regarding the above ticket yet.. Is there a WeatherKit team or what?

I took the JWT token that is failing the request in production environment and submit a request with the token via Postman, and it works just fine.. Apple developer team please help here....

Did you ever got an answer to this? I am running into the same issue now so I assume this is not fixed yet. Basically any combinations of dailyStart and dailyEnd are always returning 10 days forecast from the current date. Do you have any idea of when this historical data will be available? Thanks!

from the official set up document, it is saying that WeatherKit should be under the App Services tab. FWIW, I also don't find it under the Capabilities tab. https://help.apple.com/developer-account/#/devfe6684fd6