Thank you for getting back to us with that information, jakudo. It’s appreciated.
We took a look and compared the photos you’ve sent of your iPhone and your spouses, so we have a couple of things we’d like you to try:
Using Dual SIM with an eSIM - Apple Support -- Whichever iPhone is using two phone lines, turn one of them off for a bit.
Use Focus on your iPhone or iPad - Apple Support -- Make sure that there’s not a Focus running on either device.
Once that’s completed, compare the weather report on both devices.
If they’re still different, we recommend contacting Apple Support to look into this further with you: Get Support
If you’re unable to reach them using the link above, you can locate the Apple Support number in your country or one nearest you here: Contact Apple for support and service - Apple Support
All the best.