We go July/August usually and love it, it's my favourite time to go, the heat is hot & sticky but your in the happiest place on earth, at least you know you'll have nice weather

Id much rather the heat and humidity of disney world than go on a holiday here and have a week of rain and cold (even in the summer lol)
We always buy a fan each with the water spray they are a god send

remember you can always escape the heat by going swimming or going into an air-conditioned shop, and you will always go back to an air-conditioned room at the end of the day so you'll be able to sleep comfortably and you'll be well rested for your next day
back in 2013 when I last went we wanted to sit down main street so we had a good spot for the parade, only problem was the floor was too hot, we ended up going in a shop and hitting a towel just so we could sit down lol, maybe take something to sit on if you want to get a decent spot for the parade

we took cooling mist body spray

was heavenly, think my mum got it from either boots, Avon or Asda.
Don't worry of you get caught in the rain and get soaked through, you'll drive of quickly any way haha! However Id say take shelter in a storm and even just after last time we took shelter at the bus stops at Magic Kingdom and once the rain stopped we made our way to the entrance, the clouds were no longer over head and sly was clearing and a strike of lighted came out of no where and hit the ground next to us!! We have never been so close to being struck by lightening before, an it was so loud it scared a lot of kids! But to be fair it scared us adults! So just be careful
