Category | Heat index °C (°F)* | Wet bulb globe temperature °C (°F) | Suggested action |
Extreme danger | ≥52 (≥126) | >29 (>85) | Cancel organized athletic activities. |
Danger | 40 to 52 (104 to 125) | 26 to 29 (79 to 84) | Restrict activities for unacclimated children and those at high risk for heat illness.¶ |
Reschedule activities to a cooler time of day. | |||
Increase number of rest periods, hydration breaks, and frequency of substitution during practice and competition. | |||
Extreme caution | 33 to 40 (91 to 104) | 24 to 25.9 (75 to 78.6) | Reschedule activities to a cooler time of day. |
Increase number of rest periods, hydration breaks, and frequency of substitution during practice and competition. | |||
Caution | 27 to 32 (80 to 90) | <24 (<75) | Unrestricted activity but monitor participants for signs of heat illness. |
* Temperature ranges only are provided. For corresponding humidity values, refer to UpToDate content on heat index. Full sun exposure may increase the heat index value by as much as 8°C (15°F).
¶ Refer to UpToDate topics on heat stroke in children.Do you want to add Medilib to your home screen?