I’ve been happy with 1Weather. The ad-free “pro” version is $1.99 IIRC.
Andriod:
iPhone:
Also seconding the recommendation of Dark Sky, which I used to use.
Andriod:
https://play.google.com/store/apps/details?id=net.darksky.darksky
iPhone:
I think I’m gonna check out WTForecast 
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