Penn State researchers found that the maximum wet-bulb temperature humans can endure is lower than previously thought — about 31°C wet-bulb or 87°F at 100% humidity — even for young, healthy subjects. The temperature for older populations, who are more vulnerable to heat, is likely even lower.
For the Sahara, I found that one of the hottest areas is Ouargla, Algeria. The highest forecasted temperature will be 47 degC with rel. humidity of 6%. This is equivalent to a wet bulb temp of 20 degC (< 31 degC limit).
For jungles, Belmopan, Belize has forecasted temps for this week up to 33 degC with 56% rel. humidty (wet bulb temp = 26 degC).
you can use this calculator with values from different cities
For the Sahara, I found that one of the hottest areas is Ouargla, Algeria. The highest forecasted temperature will be 47 degC with rel. humidity of 6%. This is equivalent to a wet bulb temp of 20 degC (< 31 degC limit).
For jungles, Belmopan, Belize has forecasted temps for this week up to 33 degC with 56% rel. humidty (wet bulb temp = 26 degC).
you can use this calculator with values from different cities