I also use weawow ... with darksky as the provider. The other providers (at least the free ones) seem far less accurate (for Seattle anyway).

I've started using willyweather for higher-fidelity UV data, and its forecasts (from NOAA) seem reasonable and I like the forecast-vs-actual graph. Though the UI requires some extra clicks to get all the info that weawow manages to get onto a single user-friendly page. (First-world problems....)

Exodus Privacy gives wX a clean bill of health, but weawow seems to contain a tracker, which is unfortunate given that it will need access to my location to be useful.

wX is truly amazing. I don't understand why it's not more popular. I guess the UX is focused on nerds and power users so it may not get a lot of love from those just looking for a quick forecast at a glance.