Bonjour,
In US, they use Heat Index, in french Canada (here I am), they use "Humidex", but when you work or sport in windy unshaded, clouded or not, upon sun angle conditions, I would prefer WBGT to determine the type of efforts I could do without exhaustion.
I webbed NOAA-National Weather Service (https://digital.mdl.nws.noaa.gov/) selecting WBGT display. I also webbed https://www.weather.gov/ict/WBGT, https://perryweather.com/2020/07/30/heat-index-wet-bulb-globe-temp/ and https://en.wikipedia.org/wiki/Wet-bulb_globe_temperature.
I am convinced that your users would appreciate this kind of information.
Daniel