Montréal
September
Weather in Montréal for September 2025
Your guide to Montréal weather in September - trends and predictions
In general, the average temperature in Montréal at the beginning of September is 25.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.6 °C by the end of September.
Montréal sees moderate rainfall in September, averaging 7 rainy days.
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23
Dry days
7
Rainy days
0
Snow days
23°/12°
Temperatures
12 km/h
Avg max wind
74 %
Avg humidity
Montréal in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  24° | 2 22° | 3 24° | 4 27° | 5 29° | 6 27° | 7  25° |
| 8  19° | 9  21° | 10 20° | 11 22° | 12 24° | 13  23° | 14 21° |
| 15 24° | 16 24° | 17  27° | 18 24° | 19  23° | 20 23° | 21 21° |
| 22 21° | 23 20° | 24 22° | 25  17° | 26 19° | 27 20° | 28 21° |
| 29 21° | 30 24° |
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Temperatures trend during September in Montréal
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Mist | 24° /11° | 1.8 mm | 5 | |
| 2 Sept. | Mist | 22° /11° | 0 mm | 5 | |
| 3 Sept. | Mist | 24° /13° | 0 mm | 6 | |
| 4 Sept. | Mist | 27° /15° | 0 mm | 7 | |
| 5 Sept. | Mist | 29° /17° | 0 mm | 7 | |
| 6 Sept. | Mist | 27° /18° | 0 mm | 6 | |
| 7 Sept. | Patchy light rain with thunder | 25° /14° | 6.4 mm | 6 | |
| 8 Sept. | Light rain shower | 19° /12° | 22.4 mm | 5 | |
| 9 Sept. | Overcast | 21° /9° | 0 mm | 5 | |
| 10 Sept. | Light rain shower | 20° /12° | 6.8 mm | 5 | |
| 11 Sept. | Overcast | 22° /11° | 4 mm | 6 | |
| 12 Sept. | Overcast | 24° /12° | 0.5 mm | 6 | |
| 13 Sept. | Moderate rain | 23° /13° | 8.3 mm | 6 | |
| 14 Sept. | Overcast | 21° /13° | 0 mm | 6 | |
| 15 Sept. | Mist | 24° /12° | 0 mm | 6 | |
| 16 Sept. | Overcast | 24° /15° | 0 mm | 6 | |
| 17 Sept. | Partly cloudy | 27° /14° | 0.1 mm | 7 | |
| 18 Sept. | Light rain shower | 24° /14° | 0.6 mm | 6 | |
| 19 Sept. | Heavy rain | 23° /14° | 11.6 mm | 5 | |
| 20 Sept. | Overcast | 23° /12° | 0 mm | 6 | |
| 21 Sept. | Mist | 21° /9° | 0 mm | 5 | |
| 22 Sept. | Mist | 21° /11° | 0 mm | 5 | |
| 23 Sept. | Mist | 20° /11° | 0 mm | 5 | |
| 24 Sept. | Partly cloudy | 22° /11° | 0 mm | 6 | |
| 25 Sept. | Sunny | 17° /10° | 17.4 mm | 5 | |
| 26 Sept. | Mist | 19° /9° | 83.7 mm | 5 | |
| 27 Sept. | Mist | 20° /8° | 0 mm | 5 | |
| 28 Sept. | Mist | 21° /10° | 0 mm | 5 | |
| 29 Sept. | Mist | 21° /9° | 0 mm | 5 | |
| 30 Sept. | Mist | 24° /10° | 0 mm | 6 | |
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Important Notice
Our weather forecast for Montréal in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Montréal forecast closer to your planned date for the most up-to-date weather information.
Montréal in September - FAQ
What are the expected maximum and minimum temperatures in Montréal during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Montréal during September?
Significant rainfall exceeding 111 mm is expected in Montréal during September, occurring over more than 7 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Montréal during September?
The average wind speed in Montréal during September is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Montréal
Explore the daily rainfall trends and prepare for Montréals September weather 💧
UV exposure in Montréal during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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