September · Canada
Best time to visit Montreal in September Weather, crowds & prices
Weather in Montreal in September
Average temperature 18°C, 58 mm of rain, about 13 days with 6+ hours of sunshine and 75% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
8.3/10
Ranked #2 of 12 months
- Avg temp
- 18°C
- Rainfall
- 58 mm
- Humidity
- 75%
- Days with 6h+ sun
- 13
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Montreal scores 8.3/10 for sightseeing and cultural travel - one of the top 12-month picks (#2). Expect around 18°C, 58 mm of rain, and roughly 13 days with 6+ hours of sunshine this month.
Montréal sets Old Montréal's stone streets below Mount Royal, with Plateau cafés and bagels nearby.
September in Montreal: strong conditions, 2nd of 12
September averages 18°C (64°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Rainfall runs 58 mm, so plan one flexible day in three; you still get about 13 days with 6+ hours of sunshine and 12.3 hours of daylight.
It scores 8.3/10 here, 2nd of 12 months, against 8.7/10 in the destination's best month.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Figure on mid-season pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Montreal in September?
- In September, Montreal averages 18°C, 58 mm of rain, and about 13 days with 6+ hours of sunshine. Its climate-comfort score is 8.3/10.
- Is September a good time to visit Montreal?
- September earns a 8.3/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Montreal in September?
- Expect about 58 mm of rain in September. Average humidity is 75% and there are about 13 days with 6+ hours of sunshine.
Curated in Montreal
Tickets & experiences
Things to do in Montreal
Montreal, Canada. Live activities and tours from GetYourGuide, matched to this destination.