Well, I just took a walk to a nearby LBS, about 15 minutes away. Sun is out, temps in the low 80s but low humidity. It seemed a bit warm in the sun, and the A/C felt good when I walked into the store.

A few minutes later I was in a corner of the store (not near the door where the A/C was higher), talking to a sales guy about shoe insoles, and I started to sweat. A lot.

So, was it a hot flash or am I just so acclimatized to the heat that I start to sweat at a lower core temp than usual?