It's HOT, but not unmanageable. It will probably rain for a short while every day or so. Lots of people had the spray fans, but if you want to use one buy one before you leave, the WDW are expensive, my son thinks they were $11. We didn't use those. One good thing about WDW is several lines for rides are indoors or at least shaded. One trick we used to manage the heat was going through stores to take advantage of the A/C (hint: the stores at the front of MK and MGM are connected and open to each other all the way to near the exit of the park so you can be cool AND miss the crowds on the street). We came back to the hotel to swim in the afternoon when it was hottest. When it gets hot, find a place you can eat inside...the CS places have A/C and if you have an ADR it's a great way to relax in the cool comfort. We also found that we could get free ice water from any stand selling pop (or soda or whatever you call it where you are). Some people have complained about the taste of the water, I didn't notice anything. You could also get just ice in a cup for free.