Weather Beta app from the Folks who brought you MIUI ROM
The developers behind the popular iOS-esque MIUI ROM have released an application thats called Weather Beta 1. MIUI's Weather Beta 1 is just that, a beta and therefore should not be expected to be perfect.
Weather and More on Weather Beta 1
The application is split into several APKs depending on where you live. Currently it's only available for Europe and America. A nice little feature is the ability to send am SMS to a contact, effectively telling them that you're enjoying nice hot sun instead of the snow they have.
Currently you must add this APK manually to system > app via ADB or a file manager with Root Access.
Gallery of Weather Beta 1 app photos, click to see larger images