Wet Bulb Global Temperatures Resources

Why are Wet Bulb Global Temperatures important?

Heat stress and human safety

Body's cooling mechanism: The body cools itself by sweating & evaporating that sweat. The wet bulb temperature is the key factor in how effective this process is.

☆ Dangerous conditions: When the wet bulb temperature gets too high around 35°C or 95° F, can be fatal because the body can no longer cool itself through sweating, even in the shade.

☆ Vulnerable populations: The elderly, young children, outdoor workers, homeless, and people with underlying health conditions are particularly at risk from high wet bulb temperatures. 

☆You Can Assess You Risk with simple Low Cost Tools

Wet Bulb Temperature tools for everyday use, for everyone.  For under £30, a small battery powered digital thermometer / datalogger with blutooth and a smartphone app can provide relative humidity in % & temperature in Degrees Celcius or Farenheit. The app can provide graphical output. 
YouTube short

The ThreeH Thermohygrometer has a WB (Wet Bulb display). This low cost unit is perfect for portability, for field use.
Download, colour print & laminate wet bulb tables for later use. Keep them with your thermometer.

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Self-Rescue from heat exhaustion can be difficult due to confusion and brain fog being an early symptoms of heat exhaustion.

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Link to British Red Cross.

How to stay cool during Wet Bulb Events:

Try to get into shade if you are outside, without excess exertion.

All movement generates heat which you can't shed so it makes you hotter. 

Try and get into an air conditioned building if you are in a city.

Sit in a paddling pool in the shade in your garden.

Drink ice cold drinks. Stay indoors amd create air movement with a fan.

Sitting in the shade with your feet in a bucket of cold water.

Prioritize staying hydrated with water and electrolytes

Take cool showers or use cold compresses. 

Wear loose, light-colored, breathable clothing.

Avoid strenuous outdoor activities.

Encouage children into the paddling pool too.

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Did you know the MOD uses Wet Bulb Tables for safety of staff on exercises and physical training. 




"Where it is assessed there may be an elevated risk of heat illness, commanders are to ensure that Wet Bulb Globe Temperature (WBGT) monitors are readily available wherever possible and used correctly in order to inform the proactive and dynamic application of risk management procedures. WBGT readings alone should not be used as the only indicator of risk or as a go/no-go. They should be used as a tool to inform a commander’s own risk assessment. WBGT readings may rise quickly which could lead to a given activity continuing when it is no longer safe to do so. Therefore consideration should be given to checking WBGT periodically throughout an activity."


"Failure to learn lessons following the 2013 death of 3 soldiers whilst on a training exercise in the Brecon Beacons.."

"The mandatory requirement to take Wet Bulb Globe Temperature (WBGT) readings, in accordance with JSP539 (where there is an elevated risk of heat illness) before physical testing and loaded march training has now been included in policy, as has the need for it to inform a risk assessment.


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Further Information from the UK MET Office.

Author: Press Office
27 June 2025

Author: Press Office
7 August 2025


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The Wet Bulb Information Project Crowd Funder. For Review, this will go live in a few days.

Why do I need money?

Education & Outreach
There is a lack of education in the UK for us ordinary people about wet bulb temperatures and severe heat. Millitary commanders have to work to strict heat /humidity guidelines for soldiers doing physical tasks.

Employers dont really understand when its too hot to work.

I will be doing 4 things. Providing educational materials, hardware: Thermohygromenters with Wetbulb calculators built in, outreach in the form of talks and stands at shows & festivals, and education to communities in the Global South on Wet Bulb Temperature risk. 

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