Wet bulb 35°C, which feels like 160°F dry bulb for those of us who are in the USA with varying amounts of water in the air.

> The wet-bulb temperature is defined as the temperature of a parcel of air cooled to saturation (100% relative humidity) by the evaporation of water into it ... The theoretical limit to human survival for more than a few hours in the shade, even with unlimited water, is 35 °C (95 °F) – theoretically equivalent to a heat index of 70 °C (160 °F)

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

A wet-bulb temperature of 35C is equivalent to a heat index of 70C (160F).