There's rain right now, but latest radar and satellite trends show a clearing sky over the Space Coast, just in time for the launch of STS-128 overnight. The launch is set for 1:36AM. Here's the track and the areas that can see the launch.
http://www.space.com/spacewatch/090824-see-shuttle-discovery.html
http://www.nasa.gov/mission_pages/shuttle/launch/index.html