we went in september for the first time this year and it was wonderful....the parks were empty and while it was still hot, it was nice hot not unbearable hot...
if you're that worried about hurricanes, then change to May.....early May is probably better than the end of May, since lots of people take their kids out of school around memorial day (since it's so close to the end of the school year they just don't care about missing school at that point)...we once went towards the end of May and were shocked by the crowds....