Average Temps Range from 50/60's at night to 70/80's during the day. Very comfortable and not bad swimming weather as it warms up quickly enough that by 10:00am it is already near 70's. Wetsuits at DC are enough.
Another advantage of October Florida weather is the lack of the everyday Summer Thunderstorm. Sure you may get hit by one, but chances are that in October it is rare.
Theme park crowds are also apparently at their lowest, except for the extra ticket event HHN. September through Thanksgiving is the Locals secret. Kids are in School and everyone is done with their Summer Vacation and busy planning their Holiday Trips. It's our season to visit the theme parks without the out-of-towner crowds.
Come on down, a few more visitors will be welcomed and you are sure to enjoy yourself. Just stay away from HHN if you want to avoid crowds.
HAVE FUN