Like the runner The rule of thumb is, you should always dress as 20 degrees warmer than it is. That’s why you see runners in shirts and shorts when they’re 45 degrees outside: Once your furnace is put in place, winter turns in spring and spring turns in summer.
But what do you do when it is already summer? When a heat wave puts records apparently every month, and when the humidity rises with temperature, making the ambient air feel like an oppressive sweater? Well, for one, reset your expectations. You will be slower, and everything will feel harder. You also need to think a little more about your running gear – make sure you have enough water and are as comfortable as possible.
There is no general truism to run in the heat, and acclimatization is a hell of a drug: Some people don’t leave home without enough water for a night camp, while some camels can happily flee under the blazing sun. for an hour without remark. However, make sure you are prepared, from the best shoes to sunscreen to hydration packs. Something to stay out of the dreadmill, right?
Updated July 2021: We’ve removed older options, such as the Supergoop sunscreen, and added new ones, such as the Coros 2 and EU Fits.