Montemurro is married, and has two children with his wife Linda. He is of Italian descent as his family moved from southern Italy to settle in Australia, following the end of World War II. Montemurro became an Arsenal supporter at the age of seven, when his brother returned home with a replica kit. The 1979 FA Cup Final, in which Arsenal beat Manchester United 3–2, served as a inspiration for Montemurro to pursue a career in football.