Châteauguay
September
Weather in Châteauguay for September 2025
Your guide to Châteauguay weather in September - trends and predictions
In general, the average temperature in Châteauguay at the beginning of September is 25 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.4 °C by the end of September.
Châteauguay sees moderate rainfall in September, averaging 8 rainy days.
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22
Dry days
8
Rainy days
0
Snow days
23°/11°
Temperatures
14 km/h
Avg max wind
76 %
Avg humidity
Châteauguay in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  24° | 2 22° | 3 24° | 4 27° | 5 27° | 6  27° | 7  24° |
| 8  19° | 9  20° | 10 19° | 11 22° | 12 24° | 13  22° | 14 21° |
| 15  24° | 16 24° | 17 25° | 18 23° | 19  23° | 20 23° | 21 22° |
| 22 22° | 23 20° | 24 21° | 25  17° | 26 19° | 27 21° | 28 21° |
| 29 21° | 30 23° |
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Temperatures trend during September in Châteauguay
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° /10° | 4.2 mm | 5 | |
| 2 Sept. | Mist | 22° /11° | 0 mm | 5 | |
| 3 Sept. | Mist | 24° /12° | 0 mm | 6 | |
| 4 Sept. | Mist | 27° /14° | 0 mm | 7 | |
| 5 Sept. | Mist | 27° /17° | 0 mm | 6 | |
| 6 Sept. | Cloudy | 27° /17° | 0.1 mm | 6 | |
| 7 Sept. | Patchy light rain with thunder | 24° /14° | 10.5 mm | 5 | |
| 8 Sept. | Light rain shower | 19° /11° | 24.5 mm | 5 | |
| 9 Sept. | Overcast | 20° /9° | 0 mm | 5 | |
| 10 Sept. | Light rain shower | 19° /11° | 8.1 mm | 5 | |
| 11 Sept. | Overcast | 22° /11° | 3 mm | 6 | |
| 12 Sept. | Mist | 24° /12° | 1.5 mm | 6 | |
| 13 Sept. | Moderate rain | 22° /13° | 6.7 mm | 6 | |
| 14 Sept. | Overcast | 21° /12° | 0 mm | 6 | |
| 15 Sept. | Partly cloudy | 24° /11° | 0 mm | 7 | |
| 16 Sept. | Overcast | 24° /14° | 0 mm | 6 | |
| 17 Sept. | Partly cloudy | 25° /12° | 0 mm | 6 | |
| 18 Sept. | Fog | 23° /13° | 0.8 mm | 6 | |
| 19 Sept. | Heavy rain | 23° /14° | 12.2 mm | 5 | |
| 20 Sept. | Cloudy | 23° /11° | 0 mm | 5 | |
| 21 Sept. | Partly cloudy | 22° /9° | 0 mm | 6 | |
| 22 Sept. | Mist | 22° /10° | 0 mm | 5 | |
| 23 Sept. | Mist | 20° /10° | 0 mm | 5 | |
| 24 Sept. | Cloudy | 21° /12° | 0 mm | 6 | |
| 25 Sept. | Sunny | 17° /10° | 17 mm | 5 | |
| 26 Sept. | Partly cloudy | 19° /9° | 79.3 mm | 5 | |
| 27 Sept. | Mist | 21° /8° | 0 mm | 5 | |
| 28 Sept. | Mist | 21° /10° | 0 mm | 5 | |
| 29 Sept. | Mist | 21° /9° | 0 mm | 5 | |
| 30 Sept. | Mist | 23° /11° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Châteauguay 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 Châteauguay forecast closer to your planned date for the most up-to-date weather information.
Châteauguay in September - FAQ
What are the expected maximum and minimum temperatures in Châteauguay during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Châteauguay during September?
Significant rainfall exceeding 118.2 mm is expected in Châteauguay during September, occurring over more than 8 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Châteauguay during September?
The average wind speed in Châteauguay during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Châteauguay
Explore the daily rainfall trends and prepare for Châteauguays September weather 💧
UV exposure in Châteauguay during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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