The weather here got into the 80's so the leather jacket got hung up and the mesh jacket got taken out.
Last summer my typical gear was a full face helmet, mesh jacket, pants (non motorcycle), gloves, and boots.
I've since switched to a modular helmet, noninsulated gloves (ok the insulation in the old ones were shot anyways) and added some Motoboss riding pants that are not vented in anyway. I expect these to be quite warm come July/August, but will still wear them, as I've found I'm not comfortable not wearing them (might switch to shorts underneath instead of pants).
I've found if I can keep my torso cool my legs are ok, besides the pants help sheild my legs from the heat of the engine.
"I drank what?" -- Socrates
Never buy a fur coat from a man being chased by a naked bear.