Conventional wisdom may tell you that if you are hot, drinking something cold will cool down your body. However, research has shown that on a hot day, drinking a hot beverage may help your body stay cool. The reason being that when you drink a hot drink, your body produces sweat to cool down your body temperature. Initially you may be adding heat by drinking the hot liquid, but the amount of sweat that your body produces to cool down more than makes up for the added heat from the liquid. The increased perspiration is key; when the sweat evaporates from your skin, it is able to cool down your body temperature. 

So, the next time you want to cool down, drinking something hot!