Hi SeAsia!
  Packing for a trip to the 
Walt Disney World Resort can be super stressful, especially when you don't know exactly what to expect!  I am from Georgia, so generally, I am used to warmer temperatures.  That being said, I still make sure to dress in layers so I am not sweating too much in the higher temperatures.  The heat affects everyone differently, but I would suggest that you be prepared for highs in the 80s and lows in the upper 50s or lower 60s.  For me, that means making sure that I have a sweater for my early mornings and late nights and a cooler outfit for the heat of the afternoon.   
 Generally, when I am going to the parks, I wear running shorts and a tank top, and I usually bring a light sweater that I can tie around my waist or stuff into a backpack when it gets warmer.  I also recommend that you bring a poncho.  Florida weather is notorious for unexpected showers, so I like to be prepared.  If you are more heat sensitive, I recommend bringing a small fan or cooling cloth, just in case you find yourself feeling a bit overheated.  Last, but certainly not least, drink water!  There is always water available in the parks, but I like to bring my own water bottle to make sure that I remember to drink it. 
 Have a Great Big Beautiful Tomorrow!
 -Lindsey N.