Hottest (avg)
#4 / 12
Montreal in September
September weather, climate averages, and packing tips.
Avg High
Avg Low
Rain
Daylight 13h
What to expect
As autumn continues, September brings, where temperatures are dropping quickly. Thermometers typically reach 20°C / 67°F, with evenings cooling to 11°C / 52°F.
The atmosphere is generally mild but frequently damp, typical of changeable seasons.
September in context
How it compares to the rest of the year in Montreal.
Wettest (avg)
#7 / 12
Daylight Hours
#6 / 12
Windiest (avg)
#10 / 12
Highest UV
#6 / 12
Most Humid
#5 / 12
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight
- 12.5 hours
- UV index (max)
- 6
- Typical sun hours
- 05:33 – 18:04
Rain & Snow
- Total
-
- Rainy days
- 12
- Cloud cover
- 54%
- Snowfall
-
Humidity & Wind
- Humidity (avg)
- 73%
- Wind (avg)
-
- Wind (max gusts)
-
Frequently asked questions
Is September a good time to visit Montreal?
Typical September days in Montreal reach highs of 19°C (66°F) with nights around 11°C (52°F). It usually feels mild by day and cool after dark. Overall, September sits in the middle of the Montreal climate range.
What are temperatures like in September?
In September, you can usually expect highs of 19°C (66°F) and lows near 11°C (52°F). That means mild days and cool nights, so pack layers you can add or remove.
How much does it rain in September?
Rainfall in September averages 90 mm (3.5 in) across roughly 12 days. Overall it is a quite rainy time of year, so a light rain jacket and waterproof shoes are very handy.
How many hours of daylight are there in September?
You can expect about 13 hours of daylight in September. Sunrise is typically around 05:33 and sunset near 18:04. Daylight is fairly typical, with enough time for sightseeing.
Does the weather change during September?
September usually begins milder and cools down as the month goes on, so late-September can feel more like the next month.
How strong is the sun in September?
UV levels are often high (around 6). Regular sunscreen and a hat are recommended.
Is it windy in September?
In September, average wind speeds are around 11 km/h (7 mph), with gusts on the windiest days reaching about 52 km/h (32 mph). On the ground, it is it can feel quite windy at times, particularly when weather systems move through.