We used to visit Marcia's parent regularly in July or August. Temps regularly went above 100 F, "but it's a dry heat", to flip around a Canajan mantra. I used to do my hiking in those temps, but that was usually in the shade of the forest -- more trees & shade on the northern & eastern slops of the Wasatch, as you may know, and it gets bloody hot & dry descending in the afternoon.
Watch out for the inversions in the SLC bowl, as well.
Be very careful in that weather, Jim, lotsa water, with hydra-lite (or similar) tabs.
Your beard will shade your lower neck & collarbone, though!! :-)
Best to you, Wendy and Dante,
John