This seems to be a known issue and they are working on a recalibration, but it's not available yet. I'll be sure to update the TSB/recall list when it becomes available. It will eventually read correctly, but it takes 10-15 minutes of driving before it starts giving accurate readings.
Well I hope they get it soon. It was about 85 where I live yesterday and mine was at
113 after driving for 20 minutes it did not change. It runs anywhere from 10 to 30 degrees over all the time. Had this problem on another car and the sensor was bad and I just replaced it. Have not been back to the dealer yet. But I think they will have an easy fix for it.