Ethnicity: His mother was from Piacenza. Although his father grew up in Varese, he was born in Luján in the Buenos Aires Province, Argentina, where his ancestors had emigrated to in the 19th century and built up a soft-drink and beer-production business. Monti's father went back to Argentina during World War II, but later returned to his family home in Varese.
Monti was born in Varese on 19 March 1943.
Monti is married to his wife Elsa and has two sons.