Hi, I have an iphone 7 plus. Since ios 11, the weather widget doesnt update at all. The weather app is not working fine either, I changed the location settings to only when you open the app, I tried also 'always on' but then that little arrow icon appears all the time in the top bar, so I refused.
None of the above works for your iPhone battery widget not showing iOS 13 then wait for the updates. Meanwhile, you can check if an update is available or not. Step #1: Go to “Settings” and tap “General.” Step #2: Tap “Software Update” and then Download and Install.