Heat Stress Index: WBGT

Current WBGT and Forecast

Provision of information on Heat Stress Index (WBGT) will start on April 23, 2025.

(Blue) Almost safe	(Sky) Caution	(Yellow) Warning	(Orange) Severe Warning	(Red) Danger
< 21 appropriate water replenishment suggested	21 - 25 water should be replenished often	25 - 28 rests should be provided often	28 - 31 heavy exercise prohibited	≥ 31 exercise prohibited

Note

WBGT index is one of the empirical indices representing the heat stress to which an individual is exposed. (ISO7243)

WBGT varies depending on environmental situation and condition.