Avg weather in September
12 Hrs per day
91 mm per month
76 % avg
7 Mph avg

Montreal Weather in September

destination intro image

What’s the weather like in Montreal in September?

Located in eastern Canada not far from the country’s US border, Montreal is a vibrant city in the Quebec region. It has warm summers and bitterly cold winters due to its unique climate, which also brings consistent rainfall all year round. Temperatures are cooling down in September as summer draws to a close, but things are still warm at this time. If you want to explore the city in comfortable conditions, this is a great time to visit Montreal.


The average temperature in Montreal is 16ºC in September, reaching highs of 23ºC in the peak of the afternoon. Although it’s t-shirt weather during the day, you’ll need some warmer clothes for evenings out in the city, as the average low drops to a chilly 9ºC at night. There’s around 90mm of rain forecast in Montreal over September, although you can still expect six hours of sunshine each day at this time.

View weather for