Heat index explained: How do meteorologists calculate why you feel hot?

AUSTIN (KXAN) - With blistering heat this summer, you've likely heard a few people say "it's not the head, it's the humidity." Turns out both things are true: it's called the Heat Index.The heat index is used to calculate not the actual temperature of the air around you, but instead how hot you feel. This all comes down to sweat.When the body gets too hot, it sweats to cool itself off. Beads of sweat form, then evaporate off of your skin. As they evaporate, they pull the heat away with them.
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