Orlando in September is hot and muggy. Where shorts and cotton t-shirts. Also, it rains nearly everyday. Bring a rain poncho, or hat that can fit easily into your back pack. Comfortable shoes are a must and bring lots of sun screen
I would refer to wear sneakers,crocs,thin socks or even flip flops for Disney world trip but in some cases it depends upon person`s interest in which they are comfortable.
The average high temperature in Orlando, Florida during September is 90 degrees and it is often humid. Make sure that you wear light-colored, breathable clothing, a hat and sunscreen and to drink plenty of water.
In September, it will still be hot and sunny at Disney World. You should be prepared for humid and hot weather. Be sure to wear sunblock as you will be outside for a considerable amount of time.
September in Orlando is usually still quite hot! Definitelly lots of light tops, shorts, and don't forget super comfortable walking shoes. Don't worry about dressing up - you're on vacation!