The Mercedes driver admitted the he "drove like an idiot" after coming in 12th on the grid with a poor time in the second qualifying segment.
"It was generally a really poor qualifying session," AutoSport quotes Hamilton as saying. "I didn't put one single lap together in Q2.
"I just drove like an idiot. That is the worst I have driven for a long, long time. I am sorry for the team."
Force India driver Adrian Sutil is under investigation for blocking Hamilton's final lap at the Parabolica, but the 28-year-old does not believe that the impediment was decisive.
"It doesn't matter anyway," he said of the incident. "I should have done it on the lap before anyway."