Now Weather - just released, visual weather app for iPhone (opens in new tab)

I second this. There are plenty of free, accurate and beautiful weather apps available. I was kind of hoping there would be a page which shows what _unique_ features this app provides which would be worth paying for. The features listed are available in most mainstream weather apps.

I just use http://forecast.io saved to my home screen.

Same thing on iOS, really. The weather in notification center meets most of my needs, and when it doesn't, I click through to the Apple weather app.

The only third-party weather app I use now is Dark Sky, which answers a different question: when will it stop raining?