You're only going to be gone for a day or two? If you've got a good set-up for your turtle, he should be fine during the time you've gone. Traveling and new surroundings would be stressful for your turt, so I think he would be happier in surroundings he knows. Plus, since it's getting colder where you are, I wouldn't want to risk him getting exposed to cold air, even briefly.
Before you go, you could feed him a little extra. Some people put feeder fish in the tank,and you could do this if you want. It would be good to leave an aquatic plant like anachris in the tank for him to nibble on as well as some pieces of cuttlebone.
Put your lights on timers if you haven't done so already. Check your other equipment to make sure everything's working OK. Have a nice holiday.
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-