The issue was resolved after about 8 hours for me as well. No code changed on our side, this seems to have been a WeatherKit issue.
During this whole time the Apple System Status page continued to be green: https://www.apple.com/support/systemstatus/
I'm not sure this status page can be trusted. How come a service issue that affected multiple customers didn't cause the dashboard to be yellow or red during the time it was broken?
DimitriPrado
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution