heat?
as a SOUTH Florida resident who deals with even more extreme humidity and heat than even Orlando. I will say this.
It is nearly unbearable this time of year. You will have a soaked shirt halfway through the day (not even halfway).
Here are my recommendations:
1) take a bag with extra clothes. Change halfway through the day. It makes you feel refreshed and you will be dry again.
2) keep drinking water. I know you always hear it but it's true, so true. I failed to do this once as I was not thirsty and I began feeling tired and sick halfway through the day. That is the first sign of heat stroke. Keep drinking WATER ONLY.
3). You will not avoid the heat when outside, just accept it. However plan your day accordingly. In the morning, do most of your outdoor activities. As you get closer to mid day and early afternoon, plan longer indoor attractions such as Hall of the Presidents, Country Bear Jamboree, Splash Mountain, COP, and on and on. Luckily many MK attractions are inside. However, whatever park you're in, take that advice accordingly.
Just plan on going to a cool airconditioned attraction often. Don't just sit around out in the heat. Move from one place to the next and stay in the airconditioning. LIke I said, you will feel the heat and get soaked but, luckily many Disney attractions are air conditioned.