I was about to report a similar issue, but I think the weather app in FSD is broken at the moment. I've had mine configured for a while now, and the last couple days it's not been pulling the info. I think the problem you're having is directly related to the app not functioning. It's probably something with the API backend of the host server. I suspect TeamFSD already knows about this and is working on a fix. It was broken before the F3 updates and was fixed, so I'd just wait it out.