Here is an explanation of humidity.

I wasn’t looking for such a detailed explanation; I only wanted to know if 65% is “high.” Yes, we have sixty-five percent at two o’clock in the afternoon–and the outdoor temperature is eighty-six. Indoors: Eighty-eight degrees. I have a fan oscillating in the kitchen/dining area but concede that I may have to turn on the air-conditioner for the first time this year. It is oppressively HOT!! I’m so lethargic, I can hardly move!!

Just thought you might like to know.