September in Boston typically marks a transition from summer’s heat to the crispness of autumn. Average high temperatures gradually decrease from the low 70s Fahrenheit (low 20s Celsius) at the beginning of the month to the mid-60s Fahrenheit (high teens Celsius) by the end. Overnight lows follow a similar trend, moving from the upper 50s Fahrenheit (mid-teens Celsius) to the lower 50s Fahrenheit (low teens Celsius). Rainfall remains relatively consistent with summer averages, and while hurricane season is still active, direct impacts are less frequent than in earlier months.
Understanding Boston’s climate during this period is beneficial for a variety of reasons. For tourists, it informs packing choices and activity planning. For residents, it signifies a shift in lifestyle, from outdoor summer activities to the vibrant fall foliage season. Historically, September has been a significant month for the region, marking the end of the harvest season and the beginning of preparations for colder months. This knowledge allows for better planning and adaptation to the changing conditions, impacting everything from tourism revenue to agricultural practices.
