Most cases of heat stroke can be prevented. When the temperature outside is especially high:
Drink lots of water throughout the day.
Stay indoors in an air-conditioned area whenever you feel too warm.
Wear lightweight, light-colored clothing, preferably with a loose-weave material that lets air get to your skin.
Avoid strenuous activity in the hottest part of the day (between 10 a.m. and 4 p.m.). If you must participate, take frequent breaks, limit the time that you wear a helmet by taking it off between activities, and avoid wearing heavy uniforms or equipment.
Drink less caffeine and alcohol, which can contribute to dehydration.
If you begin to feel tired, dizzy or nauseated, or if you develop a headache, get out of the heat immediately. Seek out an air-conditioned building. Drink water. If possible, take a cool shower or bath or use a hose to soak yourself.