Montreal weather in September
Monthly temperatures, rain, humidity, what to wear and what to pack — 2024–2025 historical average
Montreal September weather at a glance
In September, Montreal averages 17.4°C, with typical highs of 22.1°C and lows of 13.3°C. The historical average is 7 wet days and 73% humidity.
Montreal September temperature & humidity
Montreal September rain & wet days
Pack a compact umbrella. Keep an indoor stop available between outdoor activities.
What to wear in Montreal in September
T-shirts or long sleeves with one light outer layer should be comfortable.
- DaytimeLong sleeves and a light jacket · average high 22.1°C
- Morning & eveningLong sleeves with a jacket or cardigan · average low 13.3°C
- FootwearComfortable walking shoes; quick-dry footwear for rainy days.
Packing essentials
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Montreal September sunrise & sunset times
2026 September · Local time (America/Toronto)
| Date | Sunrise | Sunset | Daylight |
|---|---|---|---|
| 2026-09-01 | 06:16 | 19:32 | 13h 16m |
| 2026-09-15 | 06:33 | 19:05 | 12h 32m |
| 2026-09-30 | 06:51 | 18:36 | 11h 45m |
For sunset photos, arrive before the listed sunset time. Clouds, mountains and buildings can change when the sun becomes visible or disappears.
Calculated for the city coordinates with daylight saving applied. SunCalc · tz-lookup
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Montreal travel essentials
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Best months to visit Montreal
Bar height shows our simple weather-comfort score, not a safety rating; colour shows temperature.
September weather by year
Daily weather in 2025
Daily high and low temperatures; blue labels show precipitation
Frequently asked questions
What is Montreal weather like in September?
In September, Montreal averages 17.4°C, with typical highs of 22.1°C and lows of 13.3°C. The historical average is 7 wet days and 73% humidity. Our weather-comfort rating for this month is excellent.
Does it rain a lot in Montreal in September?
There are about 7 wet days in September. A compact umbrella is still useful.
What should I wear in Montreal in September?
T-shirts or long sleeves with one light outer layer should be comfortable.
What are the best months to visit Montreal?
Recent weather data rates August, September among the more comfortable months.
Where can I check Montreal weather in September in real time?
Check local webcams for the view right now and a local weather service for today’s forecast. Monthly temperatures here are historical averages.
What time are sunrise and sunset in Montreal in September?
On 2026-09-15, calculated sunrise is 06:33 and sunset is 19:05 in local time (America/Toronto). Times vary by date and terrain.
Montreal weather by month
More Americas destinations in September
Open-Meteo (CC BY 4.0) · 2024–2025 historical data, aggregated and rounded by this site. Not a forecast or long-term climate normal. Calculation method and limitations