At least once a day I have to restart the phone to get the weather to update properly.
having the same issue. but if i open the app, sometimes it updates itself.
There have been a number of posts complaining about the stock weather app and how it slows down the phone and doesn't update properly. It just may be that the app isn't very good. Others have had success with Weatherbug and the variety of other weather apps.
Stock weather app is junk. I've been using WeatherBug for years and have been really happy with it.
I use transparent clock and weather on mine. Works great.
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