As a runner as a rule, you should always dress as if it is 20 degrees warmer than it is. That’s why you see runners in singles and shorts when it drops 45 degrees: Once the furnace starts, winter turns into spring and spring into summer.
But what do you do when it is already summer? When the heat wave sets records seemingly every month, and when the humidity rises along with the temperature, why does the ambient air feel like a sweater? Well, first of all, you reset your expectations. You will be slower and everything will be harder. You should also think a little more about your racing gear – make sure you have enough water and make it as comfortable as possible.
There is no universal truism for running in the heat, and acclimatization is a hell of a drug: some people don’t leave the house without enough water to camp overnight, while some camels can happily jump under the blazing sun for an hour without noticing. In any case, be sure to be ready, from the best shoes to sunscreen to hydration packages. Anything to stay away from dreadmill, right?
Updated July 2021: We removed older choices, like Supergoop sunscreen, and added new ones, like Coros 2 and UE Fits.