We sailed there last July/August, Ft Lauderdale to Key West
, then to St Pete and back to Marathon. Hot, yes, but not unbearable and definitely enjoyable. I'm a whitey from northern climes, and I felt the heat at first; lots of sunblock and plenty of water
... My wife is latina and she just lay in the sun and tanned. We'll be there again this year with our kids
. Just look out for local thunderheads and keep online for hurricane
warnings. We saw the most awesome lightning
there, pretty frightening when it gets close though.