Welcome to the all-new iMore Forums! - We're still moving some things around, so you may see a few quirks here and there, but we're working on getting things fully completed as soon as possible. For now, take a look around, and if you run into any major issues, please let us know in this thread!
I've always been a fan of WeatherBug. It does everything I need it to and the forecasts have been pretty accurate for me.