It is indeed hot, but VERY dry, so it doesn’t feel like the kind of heat with high humidity that people who live in temperate climates, e.g., the Midatlantic, Midwest, and Southern U.S., think of. However, because it is so dry you can dehydrate very quickly. Everything and anything dries out very quickly. A wet cloth can be dry within ten minutes if there is a bit of a breeze and 30 minutes without any. (Yes, I’ve been there, including locations where they filmed.) Illness and death are real risks without protecting yourself from the sun (There is reason Bedhouins where a lot of loose-fitting clothing.), avoiding diuretics and frequently drinking water.