Down here, archery season means hot. I have hunted many times when the temp was in the 90's. The deer do acclimate, but they still don't move as much as they do later in the year when the temps go down. Our rifle season opens in October, and I have always noticed much more activity then as compared to September archery opener. I'm sure some of it has to do with the number of people in the woods, but temp is surely a factor also. It is a factor with me too. I hunt only with the bow but I go afield more in the cool of rifle season. However, don't automatically assume that it is a waste of time to hunt the warmer days.