Montérégie (Boucherville)
September
Weather in Montérégie for September 2025
Your guide to Montérégie weather in September - trends and predictions
In general, the average temperature in Montérégie at the beginning of September is 25.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20 °C by the end of September.
Montérégie experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 167.1 mm.
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Temperatures
Rain 🌧️
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21
Dry days
9
Rainy days
0
Snow days
22°/12°
Temperatures
14 km/h
Avg max wind
76 %
Avg humidity
Montérégie in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  25° | 2 21° | 3 24° | 4 27° | 5 28° | 6 27° | 7  25° |
| 8  19° | 9  20° | 10 20° | 11 22° | 12 24° | 13 23° | 14 21° |
| 15 23° | 16 24° | 17  26° | 18 24° | 19  22° | 20 23° | 21 22° |
| 22 22° | 23 20° | 24 22° | 25  17° | 26 18° | 27 20° | 28 20° |
| 29 20° | 30 23° |
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Temperatures trend during September in Montérégie
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 | 25° /10° | 1.5 mm | 6 | |
| 2 Sept. | Mist | 21° /10° | 0.1 mm | 5 | |
| 3 Sept. | Fog | 24° /12° | 0 mm | 6 | |
| 4 Sept. | Fog | 27° /14° | 0 mm | 7 | |
| 5 Sept. | Fog | 28° /17° | 0 mm | 7 | |
| 6 Sept. | Fog | 27° /17° | 0 mm | 6 | |
| 7 Sept. | Patchy light rain with thunder | 25° /14° | 5.9 mm | 6 | |
| 8 Sept. | Light rain shower | 19° /12° | 13.4 mm | 5 | |
| 9 Sept. | Overcast | 20° /8° | 0 mm | 5 | |
| 10 Sept. | Light rain shower | 20° /11° | 6.9 mm | 5 | |
| 11 Sept. | Mist | 22° /11° | 5.6 mm | 6 | |
| 12 Sept. | Overcast | 24° /12° | 0.6 mm | 6 | |
| 13 Sept. | Light rain shower | 23° /13° | 10.3 mm | 6 | |
| 14 Sept. | Mist | 21° /12° | 0 mm | 6 | |
| 15 Sept. | Mist | 23° /11° | 0 mm | 6 | |
| 16 Sept. | Overcast | 24° /14° | 0 mm | 6 | |
| 17 Sept. | Partly cloudy | 26° /13° | 0.1 mm | 7 | |
| 18 Sept. | Light rain shower | 24° /13° | 0.6 mm | 6 | |
| 19 Sept. | Heavy rain | 22° /14° | 11.3 mm | 5 | |
| 20 Sept. | Mist | 23° /12° | 0 mm | 6 | |
| 21 Sept. | Mist | 22° /8° | 0 mm | 5 | |
| 22 Sept. | Mist | 22° /9° | 0 mm | 5 | |
| 23 Sept. | Mist | 20° /10° | 0 mm | 5 | |
| 24 Sept. | Partly cloudy | 22° /11° | 0 mm | 6 | |
| 25 Sept. | Sunny | 17° /9° | 17.1 mm | 5 | |
| 26 Sept. | Mist | 18° /8° | 93.8 mm | 5 | |
| 27 Sept. | Mist | 20° /7° | 0 mm | 5 | |
| 28 Sept. | Mist | 20° /9° | 0 mm | 5 | |
| 29 Sept. | Mist | 20° /8° | 0 mm | 5 | |
| 30 Sept. | Mist | 23° /9° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Montérégie 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 Montérégie forecast closer to your planned date for the most up-to-date weather information.
Montérégie in September - FAQ
What are the expected maximum and minimum temperatures in Montérégie during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Montérégie during September?
Significant rainfall exceeding 167.1 mm is expected in Montérégie during September, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Montérégie during September?
The average wind speed in Montérégie during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Montérégie
Explore the daily rainfall trends and prepare for Montérégies September weather 💧
UV exposure in Montérégie during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Montérégie
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BouchervilleBrossardChamblyGranbyLongueuilSaint-HyacintheSaint-Jean-sur-RichelieuSalaberry-de-ValleyfieldVaudreuil-DorionWarden
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