Clima (U$0.99) packs a lot of information into a deceptively simple user interface. Enter a city or cities and you get temperature and sky conditions on a colorful background.
Swipe left and you see an extended five-day forecast with high/low temperatures. Tap on the forecast to view future wind conditions. Swipe to the right and view a graphical hourly forecast of temperatures and sky conditions. Tap once more, and rainfall predictions are displayed. Another tap provides wind predictions for the next several hours.
Tapping on the main temperature logo displays sunrise and sunset times. Dragging down will let you add locations worldwide. You can also set temperatures and wind speeds to metric if you are not U.S. centric.
Clima also supports notifications for severe weather, which is a plus. Swipe up to get the notifications feature, and you can decide what notifications you want to see: rain, high winds, snow or even temperature changes. You can even set the times that notifications are most important to you, a nice level of detailed control.