I'm retired but I have a lawn business to keep me busy. When it is hot, the grass does better to be left at least 3" high. It keeps it moist and helps it stay healthy. With the high heat, water the grass often. Cut, no more that 1/3" the length and make sure that the mowers blades are sharp. Cut in the late PM when it's cooler. You cover your head, wear a dust mask if dusty and keep hydrated just like the grass. I cut grass all summer and the dust/dirt is more trouble than the heat.
