Hello Den2010,
Thanks for asking the Apple Support Communities about the Weather app.
Go ahead and update. There are many fixes with the udaptes. Current iOS is 16.1.
About iOS 16 Updates - Apple Support
Update using Wi-Fi, or your computer if there are issues updating:
Update your iPhone or iPad - Apple Support
Next, check that your zip code is correct for the Weather app.
Check the weather on iPhone - Apple Support
If you live closer to a different zip code, such as the last street in the area for a zip code, try checking the weather for that neighboring zip code. Is it more correct to what you are experiencing?
Thanks.