webvan said:I hiked in that kind of temp at Arches (Landscape Arch area) and at one point I felt like sitting down and not moving anymore, you just lose all your strength, it's scary...Happened to me twice in the same place actually, 16 years apart!
Yes I hiked up to Delicate Arch in 107 degrees. The car park at the bottom was full but only one other person was at the top. I was pretty fit at the time, I was running 40-50 miles a week but had to sit down for half an hour on my return to the car park. You can do some long lasting and serious damage to your vital organs, even if you're an elite athlete in those sort of temperatures!
Pete