Wet Bulb Temperature

The wet bulb temperature is, at 100% humidity, equal to the air temperature. A sustained wet bulb temperature (where it's impossible to lose body heat through sweating and maintain body temperature) exceeding 35°C/95°F/308k may be fatal even to fit and healthy humans who are semi-nude, in the shade and next to a fan.

Climate change may result in wet bulb temperatures that cause mass casualties, especially with the very young, those with diabetes and/or heart disease and the very old.

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Created: 2026-07-09

Last Updated: 2026-07-09