All you folks who "KNOW" what the weather is going to be are making me LOL.
Just compare the accuracy of the on-air Weather Experts Forecasts (and the "average" temperatures) to the record-breaking cool actual temperatures this year. Here in KC... normally dry and in the 90's-100's in July-August... this year rainy 60's-80's. (We LOVE it, but its just NOT the NORM.)
There have been several trips to WDW when my DW and I are the "only ones" (just a SLIGHT exaggeration) not frantically racing thru the park's stores looking for... affordable ;-)... outerwear (how about GLOVES?) for themselves and their shivering (crying) kid-lets, to try to salvage some fun on a day (or week) that has turned "unseasonably-cold". We have been strolling, wearing our Thinsulate earmuffs, past different families who constantly ask, "WHERE can WE buy some of THOSE?" (Sorry, we brought 'em from home.)
So go ahead and "travel light." It'll be FINE...
(Bongo drum-beats, Guitar licks)
Consider, if you will... a group of wayward travelers, on the road to a warm-weather holiday... content in the notion that they are escaping the chill of a traditional Autumn... content until... they enter the "Temperature Zone."
(Bongo drum-roll, then Out)