The stirring of the atmosphere with then heating of the day is mixing dry air aloft down toward the surface. Mainly sunny skies and hot temperatures are the result. The warm dry air aloft will become more pronounced by Sunday into next week. Temperatures will climb higher above 100 at that time.
I'm expecting clear and becoming more humid tonight, low in the mid 70's. Sunny Thursday, high around 100. Mostly sunny Friday and Saturday, high around 100. Sunny Sunday through Wednesday, highs rising above 100.