Did you forget to change to summer air in your tires? :B
I would keep measuring the temps as you travel. It may be an anomaly. Over time if it runs higher try full pressure to see what you get. Maybe its in the build of that particular tire. What you could do is to swap out the tire to another position. I know this is more work but a scientific approach will alleviate some guess work.
I cancelled my reservations at My Old KY Home today since we are expecting over 1.5 of rain. Hopefully your travels will be drier.