We were in the parks 7/20-7/23 and it rained every day! The rain came in earlier than expected most days, but locals were telling me that they had had an unusually large amount of rain. Doesn't sound like it's the norm. Take a poncho or plan to buy one. Get the big outdoor rides done earlier in day. I was shocked to see the parks did not clear out as much as I would have thought during the rain!