We are certainly making up for a mild start to summer with this August heat, at least in the Northeast. Whew! Unlike some folks, I don't perspire; I sweat A LOT. Makes it hard to breath too but it's great for "heat training". Given that most of the races are in summer months, training in high heat and humidity is good preparation for race day. In fact, given safe parameters, I try to train mid day a couple of times during the summer to simulate brutal race conditions. For me, being ready for whatever race day can throw at me, takes some of the fear and anxiety out of it.
One of my favorite sayings is "Any obstacle is the direct result of improper or insufficient preparation". Well doesn't that say it all? That saying is about so much more than racing, training and exercise in general. It's a saying for life.
So what it's hot out? Drink some gatorade, do a shorter workout, stay close to home, cool down easily and get out there and exercise.