One problem related to sun roof has been reported for the 2013 Toyota Avalon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2013 Toyota Avalon based on all problems reported for the 2013 Avalon.
I drove to baltimore, MD from cherry hill, NJ on 06/16/2013 at speeds varying from 45mph - 75mph. The moment I got on to NJ turnpike, the wind and road noise were loud inside the cabin. The entire time it seemed the windows of the car were open even though the a/c was on slow, windows and sunroof were closed. (I have two older cars I. E. Hyundai elantra 2002 and Honda accord 2005 which have less cabin noise when windows are closed). Considering, this is a brand new car, high end and is supposed to be very quite, I find it a big safety risk as the noise is distracting, because I was trying to see if the windows were open, doors were properly closed and sun roof wasn't open / tilted, all the while distracting me from the road. A lot of the noise seems to be coming from around the doors and the front windshield, at one point during my journey there was a loud whooshing sound coming from the front wind shield as if there was no seal / insulation between the windshield and the body of the car.