Montreal vs Boston

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, Boston edges ahead as the better destination in September. Boston offers 9 hours of daily sunshine with only 8 rain days, while Montreal sees 9 sunshine hours and 10 rain days.

Montreal sits in the comfortable travel range at 21°C. Boston is also comfortable at 23°C.

For travelers who prioritize dry weather, Boston is the stronger choice in September.

Montreal reaches an average high of 21°C (70°F) and drops to 13°C (55°F) at night during September. The daily temperature range is 8°C, meaning moderate variation throughout the day.

Boston averages 23°C (73°F) for the high and 15°C (59°F) for the low, with a daily range of 8°C. The 2°C difference is noticeable but not dramatic.

Both cities are in the Northern Hemisphere, so they share the same seasonal pattern in September.

Montreal receives approximately 98 mm of rainfall across 10 rain days during September. You can expect rain roughly every other day.

Boston sees 90 mm over 8 rain days. That makes Boston the drier option by 2 rain days and 8 mm of total precipitation.

Both cities share similar humidity levels at 65%.