Pixlr is intuitive, reasonably capable, and runs in the browser.

Shadow Weather on Android is pretty good, a lot of people switched to it after dark sky went down. It does forecast aggregation from multiple sources like dark sky used to.

Seconding, the UI isn’t the prettiest but it has a lot of information, one of the best weather radar setups I’ve encountered, and fairly accurate predictions due to pulling data from multiple sources.

I like it fine, I just wish Google (and Microsoft, Apple, etc) would decide on a consistent UI theme instead of completely changing it every few years. They don’t even have time get all their first party apps up to date with the latest design trend before they move on to a new one, and third party apps are even worse. I have apps on my phone in like 4 different UI styles now.