Two weeks ago we were constantly at or near 100' and the humidity was pushing us to 113 and 116 for a week! And NO WIND.
My heavy breeds and black breeds were NOT happy. I opened the coop and let them roam the acreage. Predators be ******! The chickens were more likely to die from heat and humidity than predators. I turned on the barn fan in their coop, ran a sprinkler near the coop. (They;'ll play in it, and stand under it, and they love to dust bathe in wet cool sand... at least mine do) Wet down the dirt UNDER the coop, and hosed down the mulch in the run. I put up a patio umbrella to add more shade. Made giant 1 gallon ice cubes to their water bucket, and fed them frozen peas. And put electrolyte in their water
One afternoon I found my giant lavender orp not only panting, but tripping when she walked, and she had that 1000 yard stare. She immediately was put into a cool water soak. She sat there for almost 30 minutes, while I poured cool water down her neck and back. When I put her out again, she preened and drank electrolyte water and about an hour later was back to her normal self.