It's cooler in my part of AZ. Was only 93 here on the pinta rim near Hardscrabble. But I am at 6730'. Still hot in the sun though.Your body temp is 97 degrees
At 109 degrees you are vastly collecting too much heat . Works the same as an engine.
Only so much extra heat you can absorb until you drop dead
At least it's a dry heat!
(I felt obligated as an Arizona cedar rat to say that.)