When we saw the show in October it was HOT. We were kind of up near the back, so I don't know if it was any cooler towards the front. We got there well before the show started and I think it was one of the hottest waits we encountered. The family next to us had a baby (maybe about a year old) and he was so sweaty I felt sorry for him.
Definitely NOT the air conditioned comfort of Mermaid!