What to pack for Montréal in September
- t-shirts and light layers
- a light jacket for evenings
- a packable rain layer
Humidity averages 75%; max daily wind around 17 km/h.
How September compares
Best months in Montréal: May–July & September. See the full best time to visit Montréal guide.
Montréal in September: the details
In September, Montréal sees average daytime highs of 20°C (69°F) and overnight lows of 12°C (53°F). Rainfall totals roughly 80 mm across 8.7 rainy days, and the sun shines about 9.3 hours per day with 12.3 hours of daylight mid-month. Relative humidity averages 75%.
In context: September is the 4th-warmest month and the 9th-wettest in Montréal. The sunniest month is July (11.8 h/day).
| Metric | September average |
|---|---|
| Daytime high | 20°C / 69°F |
| Overnight low | 12°C / 53°F |
| Rainfall | 80 mm over 8.7 rainy days |
| Sunshine | 9.3 h/day (12.3 h daylight) |
| Humidity | 75% |
| Travel score | 9.5 / 10 |
These figures are climate normals computed from the ERA5 weather reanalysis (2019–2024) for Montréal, Canada (45.51, -73.59) — see our methodology. Actual conditions vary year to year.
Not set on Montréal? Browse the best places to visit in September ranked by travel score.
Frequently asked questions
How hot is Montréal in September?
Daytime highs in Montréal in September average 20°C (69°F); nights drop to about 12°C.
Does it rain in Montréal in September?
Expect around 8.7 rainy days and 80 mm of rainfall in September.
Is September a good time to visit Montréal?
September is one of the best months to visit Montréal. Overall travel score: 9.5/10. The best months are May–July & September.
Also good in September, near Montréal
Where should you go next month?
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