In TN it's not terrible in June, but July and August can be tough. Some of it will depend on your ability to tolerate the heat. I had a friend in high school that moved from Koos Bay, OR to Louisiana in the summer. He couldn't wash his car without having to go back into the house to cool off while we were practicing football in the same heat.
If I could be anywhere right now, I'd still be out there, on my bike, in the wilderness.
2010 Concours 14