Boston vs Montreal

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 4 sunshine hours and 4 rain days.

Boston sits in the comfortable travel range at 23°C. Montreal is cooler at 12°C.

For travelers who prioritize dry weather, Montreal is the stronger choice in September. Boston receives 5 more hours of sunshine per day, which matters for sightseeing and outdoor activities.

Boston reaches an average high of 23°C (73°F) and drops to 15°C (59°F) at night during September. The daily temperature range is 8°C, meaning moderate variation throughout the day.

Montreal averages 12°C (54°F) for the high and 0°C (32°F) for the low, with a daily range of 12°C. There is a notable 11°C gap between the two cities, so expect a very different feel.

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

Boston receives approximately 90 mm of rainfall across 8 rain days during September. You can expect rain roughly every other day.

Montreal sees 50 mm over 4 rain days. That makes Montreal the drier option by 4 rain days and 40 mm of total precipitation.

Both cities share similar humidity levels at 65%.