To stay safe in hot weather, Beavers says, it's key to drink plenty of water, and not just when you feel thirsty. Wear loose and lightweight clothing, and avoid dark colors, which soak up the heat. Stay out of the sun, and avoid any unnecessary exertion. Don't drink alcoholic or caffeinated beverages, which are dehydrating. Taking sponge baths or showers can help you keep cool, as well, though if there's high humidity, that can be less effective. Contrary to popular belief, fans aren't that great at keeping you cool, researchers say. That's because rather than circulating cooler air into the room, they simply push hot air around, potentially making you even hotter.