How much does an Asst. Professor - Mechanical Engineering make in Arizona? The average Asst. Professor - Mechanical Engineering salary in Arizona is $84,823 as of November 25, 2019, but the range typically falls between $71,083 and $100,663. Salary ranges can vary widely depending on the city and many other important factors, including education, certifications, additional skills, the number of years you have spent in your profession.