We were there last year around the same time. We come from Canada so that may skew our undestanding of hot/warm/cold about now, but we found it great. The temp was low 70s but the pools were heated and we went in. I even got a slight tan. We wore shorts and t-shirts, but had jackets and sweaters just in case. One day was quite cold (40s) all day at Epcot, but the next day back to the warmth. We are going a week after you are and I will take jackets and one sweatshirt each. Also two pairs of pants, but the rest -shorts!