Florence tends to have a higher tourist to local ratio during August as the majority of the residents head to the Tuscan beaches or mountains for summer vacation.
All month - FirenzEstate. Florence's summer festival runs from May to September, and features film and theater events, contemporary and classical music performances, and art exhibitions.
August 15 - Ferragosto. The traditional beginning of the summer holidays for most Italians, Ferragosto, which falls on the religious holiday of Assumption, is the time when Florentines head to the beach, lakes, or mountains to escape the heat (and tourists) that the height of summer brings. Read more about the Ferragosto holiday.
Continue reading: Florence in September