Welcome to NC, BikerHen! Mid July is likely to be hot and muggy, though it might not be too bad - August is the *really* bad month to me. I would say plan on 85-95 degrees and 70+ % humidity.
You're not going to be in an area I'm too familiar with - I know there's at least one TE person from Charlotte, so hopefully she will chime in with more info for you, or maybe one of the SC galsIf you happen to make it up to Raleigh/Durham give me a shout! We seem to be low on TE people around here, and I'd love to go for a ride
Carrie Anne