Apple Weather forecasts for my area have shown a 30-50% chance of precipitation for eternity, even when there isn’t a cloud in sight. My meteorologist has told his readers to ignore Apple’s forecasts.
This started around the time the Apple Weather outages a few months ago and haven’t improved. YSK that you can report inaccurate forecasts from within the app, but it hasn’t improved for me.
I’m currently using Foreca on iPhone and the free version of Carrot on Apple Watch.
That’s why when they take air temperature samples they take multiple samples from multiple locations and they explicitly don’t put them under trees, behind shade, unusually high up.
If you’re standing under a tree resulting in a lower air temperature that won’t affect the weather prediction because the temperature isn’t taken from your phone.