85 degrees F is a pleasant summer day. Double digits do not qualify as heat in the South.
Drink lots of water, and don't forget about electrolytes, otherwise, you'll cramp up.
If you need to cool off fast, run cool water over your wrists from a hose or a faucet - it's like a radiator for your blood to exchange the heat. If you are actually going to be working in the sun, it's best to wear long sleeves and pants, and let them get saturated with sweat. The evaporation will cool you, and the fabric protects your skin from the sun. Both tips for survival in the South taught to me by my late grandfather, an oil field roughneck among many other talents.