Indoor attractionsPirates of the Caribbean, Haunted Mansion, It's a Small World, Star Tours and Finding Nemo Submarine Voyage are all good bets on a rainy day.
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Here's the good news: Rain can be your biggest advantage during your visit. Since Disneyland is so embedded into our life here in Southern California, a good amount of guests are typically locals. And, locals often stay home during the rain. So, take advantage of lower lines and less crowds.
So, while rain isn't ideal, Disney does still try to provide some entertainment and with the right attitude, you'll still have a good time. Remember: A rainy day at Disney is better than a sunny day at home!
You will be pleased to learn that umbrellas are allowed inside both Theme Parks. For your reference, I believe it is also crucial to know what items are prohibited. Arnold, I commend you for visiting the Disneyland Resort on a rainy day.
You won't see princesses around the Disneyland entrance or Goofy ambling down the street in the rain. While the pre-planned character meet-and-greets will still be happening, don't plan on seeing characters just walking around. It does take away a little of the magic (probably mostly for ME!)
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.
Rain boots make the most amount of sense for a rainy day. But at least in my experience, rain boots aren't comfortable. Especially for all the walking you will be doing for a day wandering around the Park. So instead I suggest a pair of boots that will be able to be worn for more than just the rain.
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.
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.
While a rainy day in the parks is better than not being in the parks, I understand the choice to reschedule. Disneyland tickets are nonrefundable. If you have tickets with theme park ticket reservations, you can go in and cancel those reservations or just let them be.
But if you need to cancel a future theme park reservation, you have until 11:59 PM Pacific time the night before the reservation to cancel it. Then as long as your theme park admission is still valid, you can book another reservation to replace it on an available date for your admission type.