We were there two years ago in May over those same dates and as previously stated ....... Rained every single day, all day, eight days straight...... literally rivers flowing through Animal Kingdom walkways. Record rains as locals told us
. Did put a huge damper on the trip, but on the flip side, the parks were EMPTY and we walked on to everything. I lost the gym shoes and just went with flip flops. The shows were cold because we were soaking wet and the AC was full on.
I really don't see that happening again. Accuweather is very unpredictable this far out. I know, I was following it in February for our last trip and it literally changed daily by about 15 degrees and sun to rain.
Take the rain gear and hope for the best. Take advantage of it when it does rain and have fun with it. That is what we ended up having to do and I had a daughter in a wheelchair, poncho covering the sunshade and over the back of her chair, umbrellas and ponchos for all. Don't want to have to repeat a trip like that, but hey, what are you going to do, Go Home .... NO WAY!! It's Disney!!