You won't know until a few days out.
As of right now, I couldn't imagine packing anything more than shirts and shorts. It's very hot outside right now.
I'll be there this weekend and it's going to be about 30 degrees hotter than I wanted it to be. I was hoping for 50-60degree weather. Not 80-90 degrees.
So unless a cold front comes through, or you get cold very easily, I wouldn't pack anything other than summer attire