
I am a solo canoeist and the wind has a really big impact on canoe day, so knowing what to expect in advance is key. Windy has the best wind forecast interface and visualization I've seen out there. Its presentation of temperature and rain in the 7-day forecast is also detailed and intuitive. Windy is my go-to weather app.
This app constanly gets better and better, for instance now it has a widget available for iPhone. I am just amazed at the level of detail in this app.
Definintely however for the weather nerd like myself, if you just want to know what will happen in the next hour, there are other apps for that