Wish all articles like this would start including wet bulb temperature, so reader wouldn't have to keep finding temp and humidity and find it on a chart.

A wet-bulb temperature of 95°F (35°C) is the theoretical limit for human survivability for up to six hours of exposure. This is equivalent to a heat index of 160°F (71°C). However, more recent research indicates that a wet-bulb temperature of 88°F can be hazardous even for young Aug 17, 2023

Understanding Wet-Bulb Temperature: The Risks of High Wet ...

https://climatecheck.com/blog/understanding-wet-bulb-tempera....

https://en.wikipedia.org/wiki/Wet-bulb_temperature

Edited to add Celsius

Edited to remove reference to shade.