I took my 6 year old daugther last August and I vowed I would never ever go again in that heat!!! It was absolutely unbearable- The humidity was so high I would sweat just standing in the lines.
Don't get me wrong, we still had a wonderful time, - we just missed the two hurricanes and left in between and before they closed the airports - so that is another thing to be aware of. The weather is unpredictable and it rained at least once every day. One day we had the most severe thunderstorm I have ever experienced and it came on very quickly.
If I only had the option of August I woud definetly go in August because I am "disney obsessed" - So far I loved going in both January and February- had warm weather both times we went in the winter - no humidity and the line ups were almost non existent.
I am leaving tomorrow in the very early a.m. and will be experiencing Disney for the first time in April - So we will see how I make out with that.
I have to say, I am not a sun worshipper, do not sun tan and have an allergy to the sun - so going in the summer months for me was probably not a good choice. My DD had so much fun she couldn't have cared less if it was hot or not.
Anyway, any day at Disney is fabulous, whenever you end up going - ENJOY
Tink&Cinderella