I’ve recommended this app enough, it’s time to put it here. I even believed in this thing before it existed via their Kickstarter campaign.
Dark Sky is my favorite iPhone app for weather (especially living in NYC). Accurate within an hours time forecasts perfect for “Should I run to the train?” “Can I let the dog out?” and just impressing friends with the fact you can predict weather. It’s so impressive/amazing/incredible. Sometimes it’s so accurate it’s scary.
Dark Sky (App Store) $3.99 (worth it.)
Find out more on their website: http://darkskyapp.com