There is always a possibility of rain in Florida,, no matter what time of year.. Stop at an Eckard drugs, Wal-mart or other similar store and buy a half dozen of the $1.09 rain ponchos.. It will save you from having to buy the Disney ones for $10 each...
temp can range from 60 to over 80 during the day and from 45 to about 70 at night. You don't need any real cold weather clothes but bring both short and long pants and jackets or sweaters.