It sucks but the weather can't be helped. I was thinking of going to see this launch as it might be the last but glad I didn't as I 'd probably be there for a week waiting instead of a couple days.
...A July 4th liftoff at 2:37:51 p.m. EDT (1837:51 GMT) on Tuesday carries the best chance of launching Discovery this week, said U.S. Air Force Lt. Kaleb Nordgren, of the 45th Weather Squadron at Cape Canaveral Air Force Base.
Let's hope there won't be any fireworks from the shuttle on that day.
