Went to the Moroccan desert in July and August, temp was supposedly in the fifties, though our thermometer was knackered. The stupid thing was at the time I hadnt figured out how to switch off the arctic heater in the Landy (duh! Bonehead) so it was scorching! That said once we got used to it things were fine. Same cannot be said of a Nissan that travelled with us, their aircon dried the cab air out and badly dehydrated the driver to the point where he couldn't drive, 100+ miles from the nearest road. Digging a Nissan out 3-4 times a day in dune sand in those temps needs quite a bit of water! (and patience!) I took a Camelbak water carrier so I could drink constantly whilst driving - the metal of the vehicle was literally hot enough to fry eggs on, same for sand ladders *owtch*, same for sand in sandals! Desert boots are excellent kit. Boots rehydration solution is excellent and doesnt taste of chemicals, so I am told!
Take nothing but photographs, leave nothing but wheeltracks..... tread lightly.