Although you can bet on sunny days in Florida – it's called the Sunshine State for a reason – Florida can experience severe weather at certain times of the year.
If it rains during your visit, most rides will stay open, and there are indoor rides to enjoy like Jimmy Fallon, Revenge of the Mummy roller coaster, Transformers: The Ride 3D, and The Simpsons Ride.
During a thunderstorm, all outdoor rides will close, including water-themed rides. In the event of a hurricane or tropical storm, it's best to monitor the Universal Orlando website for current conditions.