I’m always surprised how much people seem to want to constantly know the weather.
I'm in Scotland. Looking outside and seeing blue skies does not mean it's safe to leave without a rain jacket, or a thermal layer. Seeing fog in the morning doesn't mean you don't need shorts for the afternoon. It being 0 outside today doesn't mean it won't be 10 degrees tomorrow. Knowing it's going to rain between 10 and 2 is good motivation to take the dog out before 10. Knowing it's going to rain on Sunday but be…
Instead you find it placed on your smartphone homescreen, on the smartwatch, on the home dashboard, on a notification you receive every morning, on your car screen, on your computer, ... I don't need to see it constantly.
Personally I believe it is something that it is easy to integrate and that users don't perceive as useless, but 99% of the time doesn't add any value