I love the wX app on Android for access to NWS data. Open source, free, no ads, and lots of data and customizability.

https://play.google.com/store/apps/details?id=joshuatee.wx

This. The best "weather app" is my bookmark to the NWS forecast in my area. The best part is that NWS doesn't name ordinary storms.

https://yr.no works great for northern europe

Yeah it's pretty good though the UI for hourly forecasts could use a bit of a touch up.

Well if you are in the US..

but its pretty great.