But like they told Joan of Arc--"Don't worry, it's a dry heat."
Vegas at 100 degrees can be tolerable, even pleasant. But when the thermometer tops 110, there's a qualitative difference. The raw energy pouring down from the sky makes any kind of exertion impossible without streams of sweat. You can't use the pool. You can't walk very far at all. And possibly the worst part is that there's so much of a heat sink, it doesn't cool down below 90 until about 4 am.
I highly recommend staying the hell away. You don't want to be anyplace that's 117 degrees, any more than you want to be somewhere where it's 52 below zero.