The hottest month in Florida is the month of August. During this month, the temperatures can rise up to 90 degrees during the day. There are days however that the temperatures do not rise to 90 degrees. The nights on the other hand are much cooler. Visit http://www.rssweather.com/climate/Florida/Tampa/ for more information.
I would say July or August. But, their summers this year have been as hot and, they have had A LOT of chances for rain. We just got back from vacation there and, the lady told us that this has not been a good summer that it has rained a lot.