Fresh Air is the best way to see weather on your iPhone.
7 day minute-by-minute interactive weather graph
Precipitation (rain, snow) amount
Precipitation (rain, snow) % likelihood
Sunrise, sunset times
Severe weather warning
Winter storms, high winds, tornados, etc.
Shows you predicted weather for your plans
Integrates with your existing calendar system
Daily weather notifications for your current location
Schedule forecast notifications for your calendar events
iOS 8 Today Extension
Weather for your current location
Today's calendar events with weather predictions