Weather location inaccurate

The “my location” section of the weather app on my iPhone 14 Plus recently changed from an accurate location to a town a few miles away and no amount of tweaking is correcting this. My series 6 Apple watch however remains accurate. Since the issue arose, there has been the major iOS 17 update, but that has not affected the error. I have tried many things including but not limited to: deleting and reinstalling the app, turning location services off and on, changing weather display preferences to a chosen location as opposed to ‘my location’ and back again, restarting throughout etc. but nothing seems to work. Location services in other apps are otherwise accurate. My partner has the same issue, although in his case he has different hardware: iPhone is an old 5SE, Apple watch also series 6. Any thoughts?