We changed plans to include Club Villain too. 
Went in September last year, and can confirm it is that hot.
I'm bringing 2 outfits a day this year (only partially motivated by the fact that I have a lot of Disney clothes, the other part is I hate being sweaty). I didn't change every day last year, but was more comfortable on days I did change.
I live in NY too and it's just a different type of heat. It's really humid too. NY feels mild in comparision.
My Club Villain outfit:
I'll have to take pics of the rest. I started putting them aside but didn't finish.

Went in September last year, and can confirm it is that hot.

I live in NY too and it's just a different type of heat. It's really humid too. NY feels mild in comparision.
My Club Villain outfit:

I'll have to take pics of the rest. I started putting them aside but didn't finish.