I say it would be absolute zero.
Vacuums are epic. I put a vacuum pump on a grape and it exploded. It also was able to make a balloon with virtually no air in it become the size of a wine bottle.
Allendale: Isn't it impossible to exist outside of the universe, because if you could somehow accomplish this, then you are still matter, and thus part of the universe?
Either way, the universe itself is expanding faster than the speed of light, so you would never be able to get there no matter what.