Live in Kentucky and ride to the Smokey area quite often. While I doubt you'll need "winter" gear in June, you never know in the mountains...
I would pack a rain suit, sweatshirt, gloves and maybe a leather jacket. A helmet with some type of face shield would be a nice thing for the wife if it starts raining or gets cold ( if Momma ain't happy, nobody's happy, right?)

I too carry several items for different riding conditions...while leather looks the best, some of the new textile jackets and pants are a lot better and can made to adapt to lots more different conditions..air vents for hotter riding, liners for cooler nights.
I like my First Gear mesh jacket with liner..helps me go with one jacket for varying conditions. Course I never go anywhere without my Gerbings

Just make sure you take care of the wife.....

 

Thanks for all the tips. I think I'm going to pack long johns. Wear the leather jacket. It has plenty of vent zippers. Take the sweatshirt and rain gear. The wife can take the heat better than I and the cold not so good. She'll wear her full leathers and full face helmet.