They don't look very droopy like the heat stressed plants I've seen. Royal Nugs is probably right_something else going on....maybe something in combination with heat stress?. But 85-100 degrees is pretty hot. I try to keep the temp at 70-80 degrees and 50% humidity during veg.
I have the opposite problem and need a dehumidifier to keep it at 50% for veg and then down to 35% for last weeks of flowering. My lights and setting the heat to 65 degrees in the grow room provide the perfect temperature, lucky me. I also use two different thermometers_ one at 5' and the other on the floor_ that way I get an idea of the temperature gradient. Its amazing that the temp at 5' can be 78 and on the floor 72.