It seems there’s an ongoing issue affecting weather forecast retrieval for some users. An increasing number of developers have reported similar problems (cases: 789157, 789900, 789564, 789319, 786126, 788811 . I’ve already reported this to Apple and will share any updates here as they come. In the meantime, I’m working on a workaround. Apologies for the inconvenience to anyone affected.
UPDATE: Apple just reported that the issue should be resolved. Please reach out at support@getsola.com if you continue to see “clear-skies” UV forecast instead of from Apple Weather.