How to Protect Yourself When Temperatures Are Extremely High
To an extent, your body can acclimate to hot and humid weather over time. Try to avoid working or exercising during times of extreme heat. Take frequent cooling breaks, drink plenty of fluids, and stop activities if you feel over-heated, lightheaded, dizzy, or faint.
Before exercise in hot and humid climates take into account the temperature and also the heat index. The heat index is a calculated measurement of the overall feeling of heat and humidity. Since sweat cannot evaporate if the water content in the air (humidity) is high, sweating alone cannot cool the body.