We just got back from WDW, the temps varied during out stay. Highs in the 70's one day and the 60's the next. Just know that highs in the 70's may mean that it reaches 70 for only a few hours in the afternoon. If you go during the warmest part of the afternoon, you should be OK, I'd say from about noon to 2 or 3. It cools down quickly after that. When we left on Monday 1/06, they were expecting a cool front with temps in the 30's at night. So you just never really know until you get there. Good luck. BTW, my kids swam at Stormalong Bay one afternoon late. The temps were probably in the low 60's. As long as they were in the water, they were fine. My husband swam with them but stayed in the hot tub most of the time. The pool temp was a little too chilly for him but we are warm blooded Texans and are used to swimming when it's 100 degrees! It's a gamble, good luck!