Summer Mowing Heights
Your grass appreciates a higher mowing height during the hot summer months. Consider bumping your mower setting up a notch to leave your grass at the taller end of this range for your type of grass. (These suggested heights are after you mow):
2-1/2 to 4 inches for Bluegrass, Ryegrass and Fescue
2 to 4 inches for St. Augustinegrass and Bahiagrass
1 to 3 inches for Centipedegrass
1/2 to 2 inches for Bermudagrass
3 /4 to 2 inches for Zoysia
Then around September you could drop down to the lower end of the range for your grass type.