*Better Weather Widget is $1.99, but is free to try for 7 days.

A lightweight, reliable weather widget that looks great. It displays the current weather conditions over background photos from Flickr. By default, Better Weather Widget finds the best photos of your current location to use.
It's highly customizable to suit your needs and can be configured to show more weather data, use different weather sources, or find alternate background photos.

Better Weather Widget is only a few megabytes in size and is extremely light on battery and resources. You can purchase it through an IAP in the settings menu. (Note that there is no app icon associated with Better Weather Widget, you need to add it to your homescreen through your device's widget menu.)