One thing we aren't short of on Android is weather applications. In the UK, the Met Office are probably the best source of weather forecasts. These now come to Android with the launch of the official Met Office application.
What you get is some pretty detailed weather maps, with a range of forecasts between three hours and a full five-day forecast. The maps are also interactive, and display national severe weather warnings. It also touts UV forecast maps, for those rare days in the UK when the sun shines.
There are some known issues already with the application involving the pressure map layer. The developers have pledged that this will be resolved in a future update. In the meantime you'll find download links after the break.