Weather app is 10-15 degrees off from The Weather Channel where it gets its data. Apple refuses to fix after user reports back to at least 2019.
The iOS Weather app supposedly pulls its data from The Weather Channel. As you can see by my screen shots for both apps, these temperatures are very off. The temperatures on the iOS Weather app can be a 10-15 degree variation from The Weather Channel which is usually accurate. I reached out to apple about this over a year ago. They provided phone troubleshooting for a while and continued to escalate my ticket but eventually just stopped calling me back. This has been going on for me over two years. I saw another user posted the same problem in 2019 and it was inaccurately marked as resolved..
I rely on the weather predications daily. Having the weather on my wrist via my Apple Watch would be extremely handy If it were accurate. Unfortunately, the data being transferred to my watch is the bad data coming from my phone.
Also, you can see by the final picture, the data coming to the watches aren’t even the same!
This has happened through numerous iPhone and Apple Watch models.