Guide

At What Temperature Is It Dangerous To Be Outside? | Know Your Limits

Outside becomes risky once heat index hits 103°F (39°C) or wind chill drops to −18°F (−28°C), with danger rising fast for kids, older adults, and long exposure. “Dangerous” isn’t one magic number. It’s what your body can handle in the moment, under the exact mix of air temperature, humidity, wind, sun, clothing, hydration, and activity.

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