alt Hacker NewsNah. This doesn't pass the smell test.
Throughout much of the Southeastern United States, we regularly see Summer temps above 100F (37C), and humidity up to 90%.
One of the two Marine Corps training bases is in South Carolina where temps and humidity are often near these values and sometimes crest them.
Most of Florida frequently passes these values every Summer.
While it is not comfortable, I can assure you, most humans are able to exert themselves without being killed in minutes from this kind of exposure.
Those do NOT occur regularly in the US at the same time (because the humidity peaks in the morning, but the temperature in the afternoon). Maybe in a few decades though.
35°C at 100% humidity is about the human survivability limit (at 6h exposure). This makes a lot of sense because humans generate ~100W of heat, but require their core temperature to stay constant-- if the environment is too hot and evaporation ineffective because of humidity, then your thermoregulation just breaks down and you die, just like from high fever.