Do we have any real world examples of this happening? That would help understanding.
https://en.wikipedia.org/wiki/2015_Pakistan_heat_wave
As far as global warming goes, study results indicate that limiting global warming to 1.5 °C would prevent most of the tropics from reaching the wet-bulb temperature of the human physiological limit of 35 °C. https://www.nature.com/articles/s41561-021-00695-3