Comfort Training?

I normally do a lot of my practicing over lunch, but with temps raising near 100 F today, I question the desire to go out in the muggy air to train.  I've gone before when it was in the 80s and I would often begin to feel like the air was just not fresh and begin to sweat. What do most people do? Train in the hot, muggy air? Back when I used to do wushu, we'd train through all types of conditions without an air conditioner. Perhaps I'm getting soft..