Former Vegas resident here. I can tell from personal experience that sidewalks and pavement get insanely hot during summer, and also something people wouldn’t think about: Astroturf is the god damn devil. Which is a common lawn alternative in the Nevada desert, it essentially becomes as hot as a million suns. Seriously, do not touch astroturf that’s been in the sun all day.
Cars can be just as bad, you learn very quickly that things left in the car will die, melt, burn, explode, etc.