Boston vs Montreal

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, Montreal edges ahead as the better destination in September. Montreal offers 9 hours of daily sunshine with only 10 rain days, while Boston sees 4 sunshine hours and 4 rain days.

Boston is on the cooler side at 13°C, requiring warmer clothing. Montreal is also comfortable at 21°C.

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

Boston reaches an average high of 13°C (55°F) and drops to 1°C (34°F) at night during September. The daily temperature range is 12°C, meaning significant temperature swings between day and night.

Montreal averages 21°C (70°F) for the high and 13°C (55°F) for the low, with a daily range of 8°C. There is a notable 8°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 50 mm of rainfall across 4 rain days during September. Rain is occasional, so a light rain jacket should suffice.

Montreal sees 98 mm over 10 rain days. That makes Boston the drier option by 6 rain days and 48 mm of total precipitation.

Both cities share similar humidity levels at 65%.