August temps in Florida: 90-100, thats in Farenheit-don't know the conversion to celcius- with 90-100% humidity. Hot and uncomfortable.
NFL pre-season games should be going on all through the month of August, but I don't think any of the schedules have been made out yet. In Florida, you've got the Miami Dolphins, Tampa Bay Buccaneers, and Jacksonville Jaguars to choose from.