in extreme heat and humidity, say upwards of 98. I won't carry any water forcing myself inside about every 60-90 minutes and cool down for 15 minutes while drinking. If not, I find I can't stay out as long even with water. I'll wind up with a paralyzing headache and nausea. Can't eat or drink at that point. very unpleasant.
I never took the heat seriously when I was younger until I learned the hard way that it can be quite dangerous. Since then I seem to be more and more sensitive to heat and the problems it can cause. Where I live, I have seen 111 f in the shade this year.
I need to move to Antartica:laughing: