The humidity . . . the humidity

It is up around 80% and it feels so  . . . . moist. When the temperature climbs, I suppose it will feel – oh, dear, now what is the word? Sultry. Yes, Sultry. It will be sultry. Because there will be an overabundance of sult in the air? Who knows where these words come from? Well, I guess Merriam Webster people do:

Etymology:
obsolete English sulter to swelter, alteration of English swelter
Date: 1594

Uh, is that because there is a lot of swelt in the air?

Say, swelt is one letter away from sweat. Coincidence?

I believe I am going to close up this post and get a grip on myself.