Longueuil
September
Weather in Longueuil for September 2025
Your guide to Longueuil weather in September - trends and predictions
In general, the average temperature in Longueuil at the beginning of September is 25.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.6 °C by the end of September.
Longueuil experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 163.6 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
73 %
Avg humidity
Longueuil in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  24° | 2 22° | 3 24° | 4 27° | 5 29° | 6 27° | 7  25° |
| 8  19° | 9  21° | 10 20° | 11 22° | 12 24° | 13  23° | 14 21° |
| 15 24° | 16 24° | 17  27° | 18 24° | 19  23° | 20 23° | 21 21° |
| 22 21° | 23 20° | 24 22° | 25  17° | 26 19° | 27 20° | 28 21° |
| 29 21° | 30 24° |
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Temperatures trend during September in Longueuil
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° /11° | 1.8 mm | 5 | |
| 2 Sept. | Mist | 22° /11° | 0 mm | 5 | |
| 3 Sept. | Mist | 24° /13° | 0 mm | 6 | |
| 4 Sept. | Mist | 27° /15° | 0 mm | 7 | |
| 5 Sept. | Mist | 29° /17° | 0 mm | 7 | |
| 6 Sept. | Mist | 27° /18° | 0 mm | 6 | |
| 7 Sept. | Patchy light rain with thunder | 25° /14° | 6.4 mm | 6 | |
| 8 Sept. | Light rain shower | 19° /12° | 22.4 mm | 5 | |
| 9 Sept. | Overcast | 21° /9° | 0 mm | 5 | |
| 10 Sept. | Light rain shower | 20° /12° | 6.8 mm | 5 | |
| 11 Sept. | Overcast | 22° /11° | 4 mm | 6 | |
| 12 Sept. | Overcast | 24° /12° | 0.5 mm | 6 | |
| 13 Sept. | Moderate rain | 23° /13° | 8.3 mm | 6 | |
| 14 Sept. | Overcast | 21° /13° | 0 mm | 6 | |
| 15 Sept. | Mist | 24° /12° | 0 mm | 6 | |
| 16 Sept. | Overcast | 24° /15° | 0 mm | 6 | |
| 17 Sept. | Partly cloudy | 27° /14° | 0.1 mm | 7 | |
| 18 Sept. | Light rain shower | 24° /14° | 0.6 mm | 6 | |
| 19 Sept. | Heavy rain | 23° /14° | 11.6 mm | 5 | |
| 20 Sept. | Overcast | 23° /12° | 0 mm | 6 | |
| 21 Sept. | Mist | 21° /9° | 0 mm | 5 | |
| 22 Sept. | Mist | 21° /11° | 0 mm | 5 | |
| 23 Sept. | Mist | 20° /11° | 0 mm | 5 | |
| 24 Sept. | Partly cloudy | 22° /11° | 0 mm | 6 | |
| 25 Sept. | Sunny | 17° /10° | 17.4 mm | 5 | |
| 26 Sept. | Mist | 19° /9° | 83.7 mm | 5 | |
| 27 Sept. | Mist | 20° /8° | 0 mm | 5 | |
| 28 Sept. | Mist | 21° /10° | 0 mm | 5 | |
| 29 Sept. | Mist | 21° /9° | 0 mm | 5 | |
| 30 Sept. | Mist | 24° /10° | 0 mm | 6 | |
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Important Notice
Our weather forecast for Longueuil 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 Longueuil forecast closer to your planned date for the most up-to-date weather information.
Longueuil in September - FAQ
What are the expected maximum and minimum temperatures in Longueuil 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 Longueuil during September?
Significant rainfall exceeding 163.6 mm is expected in Longueuil during September, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Longueuil during September?
The average wind speed in Longueuil during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Longueuil
Explore the daily rainfall trends and prepare for Longueuils September weather 💧
UV exposure in Longueuil during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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