OMG, I was just about to post a thread regarding this. Checking the forecast all the time, it was supposed to be nice, and yesterday they changed it.
So, yes for the next week it is showing POP 80-90 %, which is like almost guaranteed - and 15-20 mm of rain
I am getting really nervous about it, for the same reason as OP. We will be there for 10 days, but planning Disney for 4. I have a little more flexibility there to move our plans around, if it really rains that bad. I remember our trip to Cuba few years ago, out of 7 days it was POURING 4, like you could not even go for a walk, that is how bad it was...in May also.
I know this is a different thing, because you are not stuck in a resort, and you have many options for spending your day.... but still, I am thinking about our kids and a huge disappointment if the weather turns to be like in Cuba
Not to mention money we spent for this trip, coming from Canada... crazy!!! I know, some might say: at least it is not snowing, LOL.
So, my question is - what would be the best park to pick if it is raining a lot? Which one has the most rides that would still be working? Or, should we totally re-arrange our plans and go somewhere else for the first few days (May 21-25) and go to WDW when the weather looks better in the forecast??
Thanks!