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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 sees moderate rainfall in September, averaging 7 rainy days.

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Average dry days
23
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/11°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
82 %
Avg humidity

Saint-Jean-sur-Richelieu in September average weather

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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
Mist
24° /9° 2.6 mm 6
2 Sept. Cloudy
Cloudy
20° /9° 0.2 mm 5
3 Sept. Cloudy
Cloudy
23° /10° 0 mm 6
4 Sept. Mist
Mist
27° /14° 0 mm 7
5 Sept. Fog
Fog
27° /16° 0 mm 6
6 Sept. Fog
Fog
26° /17° 0 mm 6
7 Sept. Patchy light rain with thunder
Patchy light rain with thunder
25° /14° 5.7 mm 6
8 Sept. Light rain shower
Light rain shower
19° /11° 5.1 mm 5
9 Sept. Overcast
Overcast
19° /8° 0 mm 5
10 Sept. Light rain shower
Light rain shower
18° /10° 4.5 mm 5
11 Sept. Fog
Fog
22° /10° 4.7 mm 6
12 Sept. Mist
Mist
23° /11° 0.6 mm 6
13 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
22° /12° 15.7 mm 5
14 Sept. Mist
Mist
20° /12° 0 mm 5
15 Sept. Overcast
Overcast
22° /10° 0 mm 6
16 Sept. Overcast
Overcast
23° /13° 0 mm 6
17 Sept. Mist
Mist
25° /12° 0 mm 6
18 Sept. Fog
Fog
23° /14° 0.6 mm 6
19 Sept. Heavy rain
Heavy rain
21° /13° 10.4 mm 5
20 Sept. Cloudy
Cloudy
21° /10° 0 mm 5
21 Sept. Partly cloudy
Partly cloudy
21° /9° 0 mm 6
22 Sept. Mist
Mist
21° /9° 0 mm 5
23 Sept. Overcast
Overcast
20° /10° 0 mm 5
24 Sept. Mist
Mist
21° /10° 0 mm 6
25 Sept. Sunny
Sunny
18° /8° 18.7 mm 5
26 Sept. Sunny
Sunny
18° /9° 99.1 mm 5
27 Sept. Overcast
Overcast
19° /6° 0 mm 4
28 Sept. Mist
Mist
21° /9° 0 mm 5
29 Sept. Mist
Mist
19° /8° 0 mm 5
30 Sept. Mist
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 22° 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?
Moderate rainfall is anticipated in Saint-Jean-sur-Richelieu during September, with a total of 83.7 mm spread over approximately 7 days. Considering plans for rainy days is advisable.
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 13 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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Location coordinates Where is Saint-Jean-sur-Richelieu?

Get accurate weather forecasts for Saint-Jean-sur-Richelieu, located at latitude 45.307 and longitude -73.263. Stay updated with localized weather information tailored for Saint-Jean-sur-Richelieu.

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