How to Stay Cool in Summer Heat - Tips To Feel Fresh Your body temperatures rises when outdoor temperatures go up, explains Mathis. To maintain a normal, comfortable temperature, your body needs to release heat through its pores. A little perspiration is good. Excessive sweating, however, can cause dehydration, which dominoes into a sour mood, irritability, and sluggishness. (In extreme circumstances, it can even make a person delusional.) That’s why it’s important to keep your body temperature down before you go outside. Not only will it help you look cool but you’ll also feel more comfortable once you’re out and about. One trick to try: Place skin-care supplies in the refrigerator before hopping in the shower, suggests Joanna Schlip, a Los Angeles makeup artist. That way, after you’re dry, you can smooth on the cool products to refresh your skin. Or take it a step further: “One trick I learned is to put the metal jewelry I’m going to wear—my bracelet, necklace, and earrings—