Forecast is a tweak from the creator of the eminent LockInfo. It places a weather widget directly on your lockscreen, in place of the time and music controls. It allows you to select whatever location you want, in the native weather app. It fits seamlessly with the default iOS look, keeping your clock displayed, while also displaying the weather.

I did not make this video, nor am i responsible for the contents of it.

This tweak is available for $0.99 from the ModMyi repo.