Saint-Jean-sur-Richelieu
September
Weather in Saint-Jean-sur-Richelieu for September 2025
Your guide to Saint-Jean-sur-Richelieu weather in September - trends and predictions
In general, the average temperature in Saint-Jean-sur-Richelieu at the beginning of September is 24.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.7 °C by the end of September.
Saint-Jean-sur-Richelieu experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 167.7 mm.
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Temperatures
Rain 🌧️
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21
Dry days
9
Rainy days
0
Snow days
21°/11°
Temperatures
15 km/h
Avg max wind
80 %
Avg humidity
Saint-Jean-sur-Richelieu in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  24° | 2  20° | 3 23° | 4 27° | 5 27° | 6 26° | 7  25° |
| 8  19° | 9  19° | 10 18° | 11 22° | 12 23° | 13  22° | 14 20° |
| 15 22° | 16 23° | 17 25° | 18 23° | 19  21° | 20 21° | 21  21° |
| 22 21° | 23 20° | 24 21° | 25  18° | 26 18° | 27 19° | 28 21° |
| 29 19° | 30 22° |
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Temperatures trend during September in Saint-Jean-sur-Richelieu
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° /9° | 2.6 mm | 6 | |
| 2 Sept. | Cloudy | 20° /9° | 0.2 mm | 5 | |
| 3 Sept. | Cloudy | 23° /10° | 0 mm | 6 | |
| 4 Sept. | Mist | 27° /14° | 0 mm | 7 | |
| 5 Sept. | Fog | 27° /16° | 0 mm | 6 | |
| 6 Sept. | Fog | 26° /17° | 0 mm | 6 | |
| 7 Sept. | Patchy light rain with thunder | 25° /14° | 5.7 mm | 6 | |
| 8 Sept. | Light rain shower | 19° /11° | 5.1 mm | 5 | |
| 9 Sept. | Overcast | 19° /8° | 0 mm | 5 | |
| 10 Sept. | Light rain shower | 18° /10° | 4.5 mm | 5 | |
| 11 Sept. | Fog | 22° /10° | 4.7 mm | 6 | |
| 12 Sept. | Mist | 23° /11° | 0.6 mm | 6 | |
| 13 Sept. | Moderate or heavy rain shower | 22° /12° | 15.7 mm | 5 | |
| 14 Sept. | Mist | 20° /12° | 0 mm | 5 | |
| 15 Sept. | Overcast | 22° /10° | 0 mm | 6 | |
| 16 Sept. | Overcast | 23° /13° | 0 mm | 6 | |
| 17 Sept. | Mist | 25° /12° | 0 mm | 6 | |
| 18 Sept. | Fog | 23° /14° | 0.6 mm | 6 | |
| 19 Sept. | Heavy rain | 21° /13° | 10.4 mm | 5 | |
| 20 Sept. | Cloudy | 21° /10° | 0 mm | 5 | |
| 21 Sept. | Partly cloudy | 21° /9° | 0 mm | 6 | |
| 22 Sept. | Mist | 21° /9° | 0 mm | 5 | |
| 23 Sept. | Overcast | 20° /10° | 0 mm | 5 | |
| 24 Sept. | Mist | 21° /10° | 0 mm | 6 | |
| 25 Sept. | Sunny | 18° /8° | 18.7 mm | 5 | |
| 26 Sept. | Sunny | 18° /9° | 99.1 mm | 5 | |
| 27 Sept. | Overcast | 19° /6° | 0 mm | 4 | |
| 28 Sept. | Mist | 21° /9° | 0 mm | 5 | |
| 29 Sept. | Mist | 19° /8° | 0 mm | 5 | |
| 30 Sept. | Mist | 22° /10° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Saint-Jean-sur-Richelieu 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 Saint-Jean-sur-Richelieu forecast closer to your planned date for the most up-to-date weather information.
Saint-Jean-sur-Richelieu in September - FAQ
What are the expected maximum and minimum temperatures in Saint-Jean-sur-Richelieu during September?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Saint-Jean-sur-Richelieu during September?
Significant rainfall exceeding 167.7 mm is expected in Saint-Jean-sur-Richelieu during September, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Saint-Jean-sur-Richelieu during September?
The average wind speed in Saint-Jean-sur-Richelieu during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Saint-Jean-sur-Richelieu
Explore the daily rainfall trends and prepare for Saint-Jean-sur-Richelieus September weather 💧
UV exposure in Saint-Jean-sur-Richelieu during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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