Heat AND humidity DO suck. Make sure you have plenty to drink. You can get wicked sick in the heat and not even know it. Also make sure you have a wide brimmed hat and stay in the shade as much as possible. Try and wear light colored clothing that doesn't get soaked with sweat. Always apply sunblock. Take care of yourself in the heat. I prefer cold to heat any day, being 3/4 Russian and 1/4 English, my body is right at home in frigid temps. Heat isn't for me. Discs definitely do soften up in the heat. Might be better for approach and putts however...