Hi MizShelle,
Just some extra info I have come across;
We are headed down to Cuba in Aug as well. So def'n looking forward to the trip.
check out this site;
http://www.wunderground.com/history/airport/MUHA/1972/7/18/PlannerHistory.html
According to the weather planner on this site (it's pretty neat) - between the dates of 01 Aug and 30 Aug there is a average temp of 89 degrees F, an average low of 72 degrees F, a 47% chance of having a day over 90 degrees F / 32 degrees C, and 2 percent chance of a cloudy day (4 out of a historical 161 days).
So bring it on. It may rain an hour here and there, but - heh its been rainy here for the last two weeks.
At least in Varadero I'll be drinking rum and cokes on the ocean....
Shawn