I know a guy from Canada named Darren. Maybe you know him. Tell him I said hey. Actually I was surprised to hear that you have that kind of humidity that far north. Here in DC, humidity is a way of life starting in late May.

+1 for drinking a lot of water and keeping a conservative pace.

I have yet to muster the courage to ride shirtless. Given that, the sooner you come to grips with the fact that your shirt will stink on the way home, the sooner you'll make peace with the heat. I make sure to hang my shirt at work, but it's usually funky for the ride home. The only person that seems to notice is my wife. I kinda think she likes it.