The issue isn't so much the absolute temperature as much as the combination of temperature and humidity. A wet-bulb temp of 35C can be fatal.

https://www.cbc.ca/news/science/how-hot-is-too-hot-for-human...

According to this site, there are numerous areas of Pakistan with a wet-bulb temp well north of 35C...that seems extremely dire, and should probably not be flippantly dismissed because other places are hotter.

https://meteologix.com/pk/observations/pakistan/wet-bulb-tem...