I sweat like a pig no matter the temperature, even when I lived up north I would ski in a light sweatshirt because anything that broke the wind turned me into an oven. However, I ride my 9m commute with ~20lbs of extra weight at around 16-20 mph, so it doesn't exactly help the situation.

Luckily, there's a gym on campus that has showers that I use, so sweat isn't too much of an issue after the ride.