Hi Chacora!
I'm so glad to hear that you're planning a return visit to Walt Disney World!
Considering the months you mention you are thinking of traveling, I'd most highly recommend October. You'll find the temperatures a little cooler at this time of year, the crowds will have lessened with school being back in, and yet it will still be warm enough to enjoy the fabulous
Disney Water Parks!
Another plus for that month is that you'll have the opportunity also attend one of
Mickey's Not So Scary Halloween Parties if you choose! It's a great, special evening event, held at Magic Kingdom park on select evenings in September and October.
Please visit me again any time if I can be of assistance to you with additional planning questions you may have.
Wishing you a Magical time as you begin planning your next memorable and Magical adventure to Walt Disney World Chacora!
Kirsten