Hi Don,
I think I can speak with authority concerning heat and humidity!
My usual attire is Draggin Jeans, boots, t-shirt, & half helmet/goggles. For a jacket, I have a Joe Rocket textile which reminds me of snorkel bag material and I think is the Phoenix model. Has armor in all the right places and nice and cool everywhere else. For gloves, I have a pair that are fully armored AND perforated. Great for down here but my hands were actually cold up in GA.
This setup keeps me relatively cool even through the summer. However, no matter what I wear; if I sit in traffic, I get hot. I try to avoid downtown and its surrounding areas on the hottest days...
Here a pic of the jacket (bright red... Can you see me now?):
and a closeup (best I have) of the perforation:
