StatusWeather cydia tweak allows you to add weather of your current location on your StatusBar.
It includes support for both Celsius and Fahrenheit metrics, which can be selected from Settings. After installing StatusWeather, tap on StatusBar Time or Temperature number to present a small alert containing information about the weather. You won’t need to unlock device, scroll to Weather application then launch, you can just tap on StatusBar Time or Temperature number than tap on Launch Weather Button to Launch Weather Application from anywhere. To prevent battery draining, weather will be updated after interval.
Won’t work on iPad since there is no Weather application!
Configure options from Settings.