Everything is more spread out, so you'd be caught longer in the rain. Based on the usual summer forecast, we'd recommend a plan that includes visiting Animal Kingdom in the morning and EPCOT in the afternoon. Magic Kingdom and Disney's Hollywood Studios each have a fair amount of indoor attractions.
A notable “exception” is Tower of Terror, which can (ironically) operate through severe weather. With no lightning, its incredibly rare for heavy rain to shut down a ride for very long, if for no other reason than exceptionally heavy rain usually just can't fall that long.
Inclement weather may also affect entertainment—including shows and parades—in both parks. All outdoor attractions will close when lightning is observed in the area. We regularly update our Disneyland Resort Rules to ensure you have a safe and enjoyable experience.
What is this? The show must go on, and even when it is rainy, Disney World is open. Now, of course if Disney does happen to close for a weather event (like a hurricane) they will issue refunds then. But, if it is just a rainy day at Disney, the parks will remain open and no rain checks or refunds will be given.
Some rides and shows will close temporarily during electrical storms, heavy rains, high winds and other severe weather conditions. As soon as conditions permit safe operation, these attractions will re-open. Six Flags Discovery Kingdom does not issue rain checks or refunds.
They remain open if there is rain without lightning. Very rarely, they will close for air temperature reasons, like if the outdoor temperature won't be getting out of the 40s during the day. And of course if there are hurricane warnings, guests will be kept away from the pools.