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WBGT Heat Stress Calculator

Wet Bulb Globe Temperature estimated from live weather data. Check conditions before training, fieldwork, or travel — in sun or shade.

Sun assumes bright sunshine; wind is taken from live data.

WBGT estimate
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The gap: air temperature vs. what your body feels

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Air temp
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Wet bulb
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WBGT

Activity guidance

    Precautions & hydration

      What this means physiologically

      Children (12 and under)

      Adults

      Older adults (65 and above)

      Estimates only, computed from current air temperature, relative humidity, and 10 m wind speed (Open-Meteo). Full sun: Australian Bureau of Meteorology WBGT approximation (assumes bright sun; cloud cover is not modelled). Shade: 0.7·Tw + 0.3·Ta using the Stull (2011) wet-bulb formula. Both are then corrected for measured wind, which cools the globe term and is never allowed to push the result below the wet-bulb temperature. Between sunset and sunrise the shade model is used automatically. Risk bands follow the Japanese Ministry of the Environment heat-illness prevention guidance. Not a substitute for on-site WBGT measurement or your local occupational heat rules.

      Disclaimer: the values shown are estimates for planning and awareness, derived from public weather data. They must not replace a dedicated WBGT measurement device or official occupational heat-safety guidance.