Professors at University of Southern California make on average $162,701 over the course of nine months, the typical contract for an academic year. This is $111,695 more than the average university professor's nine month salary ($51,006).he difference between male and female average annual salaries is $17,645, which is moderately more than the average for professor salaries at universities. Nine Month Salary. Professors at University of Southern California (USC) have an average nine month salary of $162,700.