How to stay cool and motivated
Stay cool:
Take off your black shirt. Feels pretty good.
Alter your route to stop by a beach, pool, creek, pond, public water park, or The ol' swimmin' hole on the way home. I love stopping for a dip in the lake on the way home. Shoot. My shirt is already off and my shorts are already soaked with sweat anyway. Only takes a minute to cool off. Enjoy the journey!
Back down on the effort level a notch. Heat stroke is a real risk. So what if it takes an extra 5 or 10 minutes to get home.
Stay motivated:
Drive in a day or two and sit there in hot rush hour traffic for about 45 minutes/day. Watch a bike or two coast past you while you consider the option of riding in despite the heat.