We were on Kauai in August - water temps 75-77 F and I've never seen more variety in wetsuits. I dove every dive with just a rash guard and shorts, was never cold even on the three dive day at Ni'ihau. Saw some people with 7mm and a hooded vest over the top. Almost everyone dove a hood of some sort and yes, unfortunately nearly everyone dove with gloves.
Maui water temps this time of year are about the same, 75-76.
Not sure the exact reason, I'd imagine it's got a lot to do with the gloves and the location most of the folks on the boats were from, but I've also never seen a touchier group of divers in all my diving anywhere. Everyone with gloves was groping, handling, grabbing everything from "bare" rock to coral to critters. It was pretty obnoxious.