Montreal Weather in September
Canada · September climate averages and travel tips
Avg high21°C (70°F)
Avg low10°C (51°F)
Rainfall82 mm (3.2 in)
RatingExcellent 8.9/10
Expect warm days in Montreal in September: the average high is 21°C (70°F) and the average low is 10°C (51°F). September is autumn (fall) in Canada. The month is moderately rainy, with about 82 mm (3.2 in) of rain spread over 11 days. You get roughly 12.3 hours of daylight and a mix of sun and cloud.
Is September a good time to visit Montreal?
Yes — September is one of the best months to visit Montreal. The weather rates excellent (8.9/10) on our comfort score.
September weather at a glance
| Average high | 21°C (70°F) |
|---|---|
| Average low | 10°C (51°F) |
| Daily mean | 16°C (60°F) |
| Rainfall | 82 mm (3.2 in) |
| Rainy days (1 mm+) | 11 |
| Humidity | 75% |
| Cloud cover | 55% |
| Daylight | 12.3 hours |
| Est. sunshine | 6.1 hours/day |
| Wind | 9.2 km/h |
| vs August | 4°C cooler than August, with 20 mm less rain. |
What to pack for Montreal in September
- T-shirts plus a light layer for the evening
- a sweater for cool nights
- an umbrella or rain jacket
Montreal weather in other months
Jan-7°C / -18°C76 mmPoorFeb-5°C / -16°C66 mmPoorMar1°C / -9°C71 mmPoorApr10°C / -1°C98 mmPoorMay17°C / 7°C82 mmGoodJun22°C / 13°C106 mmGoodJul25°C / 16°C97 mmGoodAug25°C / 15°C102 mmGoodSep21°C / 10°C82 mmExcellentOct13°C / 4°C109 mmFairNov4°C / -3°C72 mmPoorDec-3°C / -12°C98 mmPoor
← AugustBest time to visit MontrealOctober →
Better weather in September nearby
Nearby in September
- Ottawa22°C · 81 mm
- Quebec19°C · 107 mm
- Boston, Massachusetts24°C · 97 mm
- Toronto22°C · 62 mm
- The Bronx, New York25°C · 104 mm
- Manhattan, New York25°C · 104 mm
Where else is good in September? See where to go in September.