We love heading to Orlando in November! In 2013 and 2014, we took our young son to Disney World. Both times, we went the week before Thanksgiving. The temperatures were typically in the low 80s, although the humidity made it feel a bit warmer than that. There was one day last year when the temperatures were in the 60s, so it was actually a little chilly. I would advise packing shorts and short sleeved garments primarily, along with a light jacket and perhaps a pair of pants.
In general, most days were warm enough to go swimming when we were there, so a bathing suit would be appropriate as well.
According to records, the daytime temperature averages a balmy 78 degrees. The range is usually between 75 and 80 degrees. The temps can drop to around 57 degrees at night.