Catrin it sounds like you were diligent about drinking on the ride. We had some really hot/humid days here in NC this summer, and i found that i had have one bottle of ICE COLD water with me, so I could squirt a little bit on the back of my neck throughout the ride, to help cool my body down just a bit. I usually carry 2 bottles (1 water, 1 diluted sports drink) on my rides, and drink most of them, so the only hard thing is making sure I don't use all of the water on my neck.