A couple more ideas.
Last couple of days the paper here have been runing headlines "feels Like 110" (must be slow news days) Typical temp per my hand-i-dandy BMW on board computer 91-94....humidity is dripping.
I've been alternating between Boots, perf Re'it jacket, perf gloves, and a helmet. For a shirt - short sleeve button down cotton, and for pants either jeans or shorts. A few local trips have been without the jacket.
Results.Sweating a buckets, and a couple out breaks of heat rash
Yesterday eight of us took off on a 200+ mile ride to the middle of the state looking for rain.
I wore boots, shorts, sunscreen, light shirts, jacket, perf gloves, full face heemet.
Ride Leader wore boots, shorts, tee shirt, no gloves, shorty helmet.
His wife wore boots, tee shirt, gloves, no gloves, full face helmet,
Road Warrior wore boots, jeans, mesh jacket, gloves, full face helment
Road Warrior Wife wore boots, BMW riding suit, gloves, full face helmet.
Rider Guy wore boots, jeans, tee shirt, mesh jacket, no gloves, full face helmet
Road Warrior 2 wore boots, jeans, tee shirt, gloves, full face helmet.
Road Warrior Wifw 2 wore boots, jeans, tee shirt, light jacket (non riding), gloves, full face helmet.
As you can see our attire was all over the board. No rain, but humidty, a whole lot of sweat, temps from 91-95 (indicated), and a great time.
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IBA #50026