When a hurricane is there
The park will be closed and you won’t be able to get through the gates, well you probably could, but you would go to jail. Not Disney jail, but real jail, where the mice bite and try to violate you. However, if you are on the property then you are safe. Disney Resorts are made to withstand a Category 5 hurricane. They will treat you like royalty and since they are their own municipality, you will have power sooner.
When it’s hot
You will sweat profusely and you will get dehydrated if you don’t buy the $4 bottles of water. Don’t drink the soda and beer or you will dehydrate faster. And be broker faster
When there are numerous amount of people there
Holiday’s and weekends are the worst, and holiday weekends are a no-brainer to stay away.
When you just bought new shoes
That is unless you like blisters on your feet. Never take a brand new pair of shoes into the park. Don’t buy a brand new pair of waterproof timberland boots for your July trip. Your boots will be filled with pain and suffering.
When a new ride is open
Well, it might be a good time to visit other areas of the parks except for Pandora, Seven Dwarfs Mine train, or Peter Pan’s Flight
When a new area is open
I can’t imagine what masses of humanity will be drawn to the parks once Star Wars Galaxies Edge is open.
Remember, there is no slow season no matter what anyone tells you. If you are going to go, just do it and enjoy your time. If someone says they got on all the rides with no waiting they are lying, and you shouldn’t be friends with liars.