I hate summer heat in Phoenix – and I’m sure I’d hate it in any other hot, desert city. But you know what? It’s not so much the heat that bothers me. It’s the people who don’t know how to deal with it. I’m going to clue you all in based on my experience living here since 1980.
Stop Obsessing Over the Temperature
Right, that’s it: No more posting graphics about the forecast. No checking the forecast. Look, you don’t need to know whether it’s going to be 95 or 125. In this case, knowledge isn’t power. There is literally nothing you can do as a result of knowing the exact temperature that will make summer heat in a desert any more comfortable or any less challenging. You’re gonna be hot until October, and that’s simply all there is to it. Whether it’s 95 0r 135, you should take exactly the same steps. Repeat it with me: Exactly. The. Same. Steps. The only impact knowing the temperature has is psychological, and it’s demoralizing rather than helpful.
Drink a Lot of Water, Already
I don’t want to hear anyone say "but you can drink too much water, too." Tell you what – come up with a sourced number of people who have died from hyperhydration  (aka, drinking too much water) in a given year. Then, I’ll reply with stats from the same year from dehydration deaths. Guess which one will be astronomically higher.
I’m now at 6’2, 198 pounds. I usually drink north of a gallon a day – more if I do anything outdoor. Oh, and it helps to know how to drink water. Don’t sip it: Pound a quart per sitting if you can. Read Cody Lundin’s "98.6 Degrees: The Art of Keeping Your Ass Alive" for the science behind it. Something salty to go with your water or even an electrolyte tablet now and then will also help. I have a post with more advice about hydration.
Get Out In It
If you do nothing but scuttle from air-conditioned area to air-conditioned area, you will never acclimate an iota to the summer heat. You need to spend at least some time in the heat. That doesn’t mean you need to be stupid about it, so dress right, wear sunscreen and – I can’t possibly say this enough – drink your damn water.
What does dressing right mean? On days I head to the office, I wear breathable, light clothes. Fortunately, I work in a place where people won’t think twice about my Eddie Bauer Guide Pro pants and (discontinued, damnit) Mountain Hardware McClane shirt.
On my own time, I favor my Onno hemp t-shirts and -- well, pretty much the same sort of pants I wear to work. I don’t believe in shorts. If I’ll be in the heat a long time, I’ll cover my head with something. And I never, ever hike without a pretty good bunch of gear that works for me; one of the more unusual items is a shemagh, which is great for covering up from the sun or even any sudden dust storms that blow in (yes, that happens in the summer).
Why no shorts? Because I like to cover skin from the sun. If I were really smart, I’d probably opt for a long-sleeve version of my hemp t-shirts. Look at traditional Arab dress – it’s light, flowing and layered. Great for insulation from the summer heat. Oh, and avoid wicking materials. They dry too quickly to cool you. Stick with quality cotton or – as I prefer – hemp or bamboo blends. They’ll keep you cooler and won’t make you stink.