I live in a very Humid place (Houston) and the Humidity drops as the temperatures increase,
I thought it would be worthwhile to look at the recent record in France.
Nimes-Ales-Camargue-Cevennes Airport, FR
Saint-Gilles, France History | Weather Underground
Hum, the hottest hour at 111 F (Very Hot) had a relative humidity of 12%, and a dew point of 46 F.
When it was near 101 F the RH was 18%
So we are not talking about 101 F at 75% humidity!
Many humid places start the day at 100% RH, but that amount of water occupies a smaller percentage of the warmer air,
this means that as it gets hot, the humidity drops.
You are correct that a combination of high temperature and high humidity can kill,
but thankfully those two in combination are fairly rare.