Montréal
September
Weather in Montréal for September 2025
Your guide to Montréal weather in September - trends and predictions
Until now, September 2025 in Montréal is slightly cooler than the historical average by -0.7 °C.
Expect cooler weather in the next days in Montréal with the forecast suggesting a temperature of 21.5 °C, lower than the historical average.
In general, the average temperature in Montréal at the beginning of September is 24 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.7 °C by the end of September.
Montréal in September brings notable rainfall, with an average of 20 rainy days and a total precipitation of 128.9 mm.
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Temperatures
Rain 🌧️
More
10
Dry days
20
Rainy days
0
Snow days
21°/12°
Temperatures
15 km/h
Avg max wind
71 %
Avg humidity
Montréal Weather September
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Temperatures trend during September in Montréal
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September weather in Montréal day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Mist | 23° /12° | 0.7 mm | 5 | |
| 2 Sept. |  Sunny | 23° /12° | 0 mm | 6 | |
| 3 Sept. |  Patchy rain possible | 25° /14° | 0.1 mm | 6 | |
| 4 Sept. |  Partly cloudy | 25° /13° | 3.1 mm | 6 | |
| 5 Sept. |  Moderate or heavy rain shower | 24° /14° | 5.8 mm | 6 | |
| 6 Sept. |  Overcast | 24° /15° | 6.9 mm | 5 | |
| 7 Sept. |  Cloudy | 24° /12° | 3.9 mm | 5 | |
| 8 Sept. | Moderate or heavy rain shower | 22° /12° | 10.6 mm | 5 | |
| 9 Sept. | Sunny | 23° /11° | 1 mm | 5 | |
| 10 Sept. | Sunny | 23° /12° | 2.7 mm | 5 | |
| 11 Sept. | Partly cloudy | 23° /13° | 1.6 mm | 6 | |
| 12 Sept. | Cloudy | 23° /13° | 0.9 mm | 6 | |
| 13 Sept. | Sunny | 21° /13° | 5.3 mm | 5 | |
| 14 Sept. | Partly cloudy | 25° /14° | 0 mm | 0.8 | |
| 15 Sept. | Sunny | 25° /13° | 0 mm | 1.2 | |
| 16 Sept. | Partly cloudy | 26° /11° | 0 mm | 1.2 | |
| 17 Sept. | Partly cloudy | 26° /13° | 0 mm | 1.2 | |
| 18 Sept. | Patchy rain possible | 29° /16° | 3.2 mm | 0 | |
| 19 Sept. | Patchy rain possible | 17° /12° | 0.6 mm | 4 | |
| 20 Sept. | Sunny | 18° /9° | 0 mm | 4 | |
| 21 Sept. | Sunny | 23° /9° | 0 mm | 5 | |
| 22 Sept. | Sunny | 27° /14° | 0 mm | 5 | |
| 23 Sept. | Patchy rain possible | 22° /16° | 0.4 mm | 4 | |
| 24 Sept. | Patchy rain possible | 17° /15° | 3.9 mm | 4 | |
| 25 Sept. | Cloudy | 21° /12° | 0 mm | 4 | |
| 26 Sept. | Sunny | 12° /6° | 0 mm | 3 | |
| 27 Sept. | Sunny | 13° /5° | 0 mm | 3 | |
| 28 Sept. | Overcast | 18° /9° | 0.1 mm | 4 | |
| 29 Sept. | Overcast | 17° /9° | 0.2 mm | 4 | |
| 30 Sept. | Patchy rain possible | 19° /8° | 0.1 mm | 5 | |
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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.
Change Month
Montréal in September - FAQ
What are the expected maximum and minimum temperatures in Montréal during September?
Enjoy moderate daytime temperatures of up to 21° 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 128.9 mm is expected in Montréal during September, occurring over more than 20 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 15 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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