Montreal weather in September
Montreal in September averages 15°C (60°F), 91 mm of rain and 6.9 hours of sun a day.
Of the twelve months in Montreal, September is the fourth warmest, the third wettest and the fifth sunniest.
- Average temp
- 15°C (60°F)
10–21°C · 49–70°F
- Rainfall
- 91 mm
Showers likely
- Sunshine
- 6.9 h
hours per day
What is Montreal like in September?
Daytime
Days are mild.
Rain
Some rain is likely; pack for showers.
Evening
Evenings are cooler. A layer helps after sunset.
What should I pack for Montreal in September?
A light rain jacket
About 91 mm falls this month — showers rather than washouts.
A warm mid-layer
Nights drop to around 10°C (49°F).
September compared with August and October
September in Montreal is 4.7°C cooler than August and about as wet as it, which averages 20°C (68°F).
September in Montreal is 6.9°C warmer than October and about as wet as it, which averages 8°C (47°F).
Daylight in Montreal in September
On 15 September the sun is up for 12 hours 31 minutes in Montreal, rising about 06:33 and setting about 19:04 local time.
September ends 1 hour 32 minutes shorter than it begins, so the last week of the month is a different length of day from the first.
That is 3 hours 9 minutes short of June, the longest-lit month here.
Where to stay in Montreal
Dates are a starting point for September.
Travel guides for Montreal
What to read before you book.
Montreal weather by month
TemperatureRainfall
How September compares with the rest of the year
September is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | -10°C / 14°F | 74 mm |
| February | -8°C / 18°F | 56 mm |
| March | -2°C / 28°F | 72 mm |
| April | 6°C / 42°F | 84 mm |
| May | 13°C / 56°F | 78 mm |
| June | 18°C / 65°F | 88 mm |
| July | 21°C / 70°F | 105 mm |
| August | 20°C / 68°F | 86 mm |
| September | 15°C / 60°F | 91 mm |
| October | 8°C / 47°F | 94 mm |
| November | 2°C / 35°F | 85 mm |
| December | -5°C / 23°F | 78 mm |
Check another month
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FAQs about Montreal in September
September climate averages for Montreal, 1991–2020.
Montreal averages 15°C (60°F) in September, ranging from about 10°C (49°F) at night to 21°C (70°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Some. About 91 mm falls across September, enough to need a light jacket but not enough to reshape a trip.
Yes. September averages 15°C (60°F) against 8°C (47°F) in October — 6.9°C warmer.
September is 4.7°C cooler than August, and about as wet.
Yes. September falls inside the most comfortable stretch of the year here, May to October, on temperature and rainfall together.
About 6.9 hours of sun a day on the 1991–2020 average.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what September is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 12 hours 31 minutes of daylight in mid-September, against 15 hours 40 minutes in June and 8 hours 44 minutes in December.
On 15 September, sunrise is about 06:33 and sunset about 19:04 local time. Both shift across the month — the month ends 1 hour 32 minutes shorter than it starts.
