Hi Shelby! Welcome to planDisney! I’m glad to see that you are doing some planning for your September visit! You’ve planned a great time to visit! By the time September rolls around, the busy summer crowds have usually subsided resulting in shorter wait times for attractions!
I just did a little bit of checking on the Walt Disney World Resort website. As of the posting of this answer, the Disney Parks Calendar only lists official park hours through mid-June. I’ve
linked the Disney Parks Calendar here for you to view. The calendar is updated regularly. It is a great planning tool! Notice on the calendar that you can change the month to look ahead.
Keep in mind that hours of operation are subject to change. It is true that summer hours do tend to get reduced in late summer, however, I would wait to see what the official calendar shares once September dates and hours are posted. Additionally, I find that the park hours that are posted months in advance tend to get lengthened once the actual dates get closer. So, check that calendar frequently!
Shelby, it sounds like you enjoy more time in the Disney Parks! Let’s be honest…Who doesn’t!? Here's a PRO TIP for you...If you are staying at a hotel in the Disney Resorts Collection, you will have the benefit of
Early Morning Theme Park Entry! This perk allows Guests of Disney Resort Hotels to enter any park, any day, 30-minutes prior to park opening! Also, if you happen to be staying at a deluxe resort hotel, then you also have the
Extended Evening Theme Park Hours perk! This allows deluxe resort Guests to remain in select parks for additional time on select nights!
Happy Planning!
Jonathan