I have gone on three rafting trips in the Grand Canyon, in August of '91, June of '97 and July of '02. It may be cool at the North Rim, but the bottom is just like being in PHX. When the raft is tied off on the East wall and the Sun has been pounding the rock all day, it could be incredibly hot. Fortunately, we could always go into the water if we were too hot, but the bad part- the water is about 49°F. Can't stay there forever. I have spent more time in PHX during hot weather than cool- it's hot, but it's a lot more tolerable than hot and humid, IMO. I prefer 100 and dry to 70 and humid, any day.
Went to Havasu on a family vacation- my parents had bought a couple of lots out there and wanted to see if it was a place we might move to. This was in August and the first day, we had 116°F, the next was 124°F.
I have been watching the news out there- what's the deal with all of the wrong way drivers on the freeway?