WBGT activities chart

WBGT (°C)	WBGT (°F)	Risks and permitted activities
		Intermittent activites		Continuous activities
		Non-acclimatized, unfit, or high-risk individuals	Acclimatized, fit, low-risk individuals	Continuous activities
18.4 to 22.2	65.1 to 72	Increase the rest:work ratio; monitor fluid intake	Normal activity	Risk of heat stress and other heat illnesses begin to rise; high-risk individuals should be monitored or not compete
22.3 to 25.5	72.1 to 78	Increase the rest:work ratio; decrease total duration of activity	Monitor fluid intake	Risk for all competitors is increased
25.6 to 27.7	78.1 to 82	Decrease intensity and total duration of activity	Monitor fluid intake	Risk of unfit, non-acclimatized individuals is high
27.8 to 30	82.1 to 86	Increase the rest:work ratio to 1:1; limit intense exercise; watch at-risk individuals carefully	Plan intense/prolonged activity with discretion. Watch at-risk individuals carefully	Cancel activity/competition
30.1 to 32.2	86.1 to 90	Cancel or stop practice and competition	Limit intense exercise and total exposure to heat and humidity; watch for early signs/symptoms of heat stress
>32.2	>90	Cancel exercise	Cancel exercise; heat stress exists for all athletes

WBGT: wet bulb globe temperature.

Based on guidance from the American College of Sports Medicine. Adapted from: Wet Bulb Globe Temperature. National Weather Service. Available at: https://www.weather.gov/arx/wbgt (Accessed on August 25, 2021).

Graphic 133128 Version 1.0

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WBGT activities chart