Hi there, Brandy!
Your observation on the weather is totally accurate/ While much of the country is celebrating the onset of fall, Florida is still enjoying beach-ready temperatures. In Orlando, historical data shows that the average daily humidity is 91%, while the nighttime average is 65%. You'll find temperatures in the high 80sF during the days, and the nights in the mid-70sF.
You're coming at a reasonably good time for crowds. The
Epcot International Food and Wine Festival, a hugely popular event at Walt Disney World, begins this year on September 28. While you'll see a surge in attendance that weekend, the week before should be of average attendance.
You might want to check a site like TouringPlans.com, which uses a combination of historical data and realtime reporting to determine crowd levels for a day.
Have a wonderful trip!
See you later, celebrator,
-Deborah B.