I saw this earlier. Generally, I don't care a bit about sweat, but the very high humidity combined with 90 degrees stopped me from commuting yesterday. No amount of bath wipes and sponging off myself would make me dry off and cool down, without a shower, in that weather. I know the exact point where there is nothing I can do to stop the copious sweat, even if I ride slowly. There have been days when it's 60 and humid that I am on the edge, but, the heat adds in a special mix.
I am always in awe that others can finish a ride and take off their helmet, shake out their hair, and it is straight, shiny, and dry.