The slowest month in Miami - at least in terms of tourist numbers - is in September. September represents the time during which hurricanes are most likely to make landfall in the neighbouring Caribbean or even in Florida. I was present during Hurricane Irma! Schools are out for summer further north, while children in Florida return during August. Some in the travel season call September in Miami easy season . Meaning life gets a bit easy as there are far, far fewer out of state visitors.