Hi there Ed,
While you may need to contact Apple Support about this, we'd like to confirm more details to better understand what's happening, along with ruling out some general possible causes here in Apple Support Communities:
- You mentioned that the Weather app is showing incorrectly for your region, but what exactly is it showing, and what's the weather like currently in your region? The more details you provide, the better we'll understand the issue.
- When did this first start to occur?
- Sometimes unexpected behavior can be resolved with a restart: Restart your iPhone
- We see you're using an older iPhone 5s with iOS 12, but the latest version for that model is iOS 12.5.6. You can verify this within Settings > General > About. In case you needed it, this link shows how to first back up, then Update your iPhone or iPad.
Cheers!