H.H.
SNEAKERS!!! I always bring sandals just in case, but sneakers will save some aching feet.
We have been getting higher than normal temps, but have been averaging about 80... not humid though.
Disney World is soooo much walking. Another hint is, if you're going for more than one day hit rides during parade time (magic kingdom) and everyone flocks to the castle for the parade because that's where tinkerbelle flies down, but it gets so crowded that it's tough to enjoy. I catch it down near the park entrance just outside the shops... you can sit on the curb and get a great view of where the parades first comes out... and you can head out and beat the traffic after it passes you. Enjoy your vaca!!