Bas-Saint-Laurent (Rimouski)
September
Weather in Bas-Saint-Laurent for September 2025
Your guide to Bas-Saint-Laurent weather in September - trends and predictions
In general, the average temperature in Bas-Saint-Laurent at the beginning of September is 19 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.7 °C by the end of September.
The climate of Bas-Saint-Laurent in September is notably wet, with an average of 12 rainy days.
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18
Dry days
12
Rainy days
0
Snow days
17°/10°
Temperatures
16 km/h
Avg max wind
85 %
Avg humidity
Bas-Saint-Laurent in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  20° | 2  17° | 3  17° | 4  20° | 5 20° | 6 20° | 7 19° |
| 8  17° | 9 14° | 10  13° | 11 15° | 12 17° | 13  16° | 14 15° |
| 15 16° | 16 18° | 17 20° | 18 18° | 19 15° | 20 15° | 21 13° |
| 22 15° | 23  14° | 24 14° | 25 14° | 26 13° | 27 13° | 28 13° |
| 29 15° | 30 14° |
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Temperatures trend during September in Bas-Saint-Laurent
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. | Sunny | 20° /9° | 2.5 mm | 5 | |
| 2 Sept. | Cloudy | 17° /9° | 0.1 mm | 4 | |
| 3 Sept. | Partly cloudy | 17° /10° | 0 mm | 5 | |
| 4 Sept. | Mist | 20° /12° | 0 mm | 5 | |
| 5 Sept. | Fog | 20° /13° | 0 mm | 6 | |
| 6 Sept. | Fog | 20° /13° | 0 mm | 6 | |
| 7 Sept. | Fog | 19° /12° | 4.4 mm | 5 | |
| 8 Sept. | Light rain shower | 17° /11° | 3.6 mm | 4 | |
| 9 Sept. | Fog | 14° /9° | 0.8 mm | 4 | |
| 10 Sept. | Overcast | 13° /9° | 0.4 mm | 3 | |
| 11 Sept. | Fog | 15° /9° | 0.5 mm | 4 | |
| 12 Sept. | Fog | 17° /10° | 0 mm | 5 | |
| 13 Sept. | Moderate rain | 16° /11° | 11.4 mm | 4 | |
| 14 Sept. | Moderate rain | 15° /9° | 5.4 mm | 4 | |
| 15 Sept. | Overcast | 16° /9° | 0 mm | 4 | |
| 16 Sept. | Moderate rain | 18° /12° | 8.3 mm | 5 | |
| 17 Sept. | Overcast | 20° /14° | 3.8 mm | 5 | |
| 18 Sept. | Light rain shower | 18° /12° | 0.6 mm | 5 | |
| 19 Sept. | Moderate rain | 15° /11° | 12.8 mm | 4 | |
| 20 Sept. | Patchy rain possible | 15° /9° | 2.6 mm | 4 | |
| 21 Sept. | Overcast | 13° /7° | 0 mm | 3 | |
| 22 Sept. | Overcast | 15° /6° | 0 mm | 4 | |
| 23 Sept. | Light rain | 14° /7° | 3.4 mm | 4 | |
| 24 Sept. | Overcast | 14° /7° | 0 mm | 4 | |
| 25 Sept. | Patchy rain possible | 14° /7° | 0 mm | 3 | |
| 26 Sept. | Mist | 13° /8° | 14.4 mm | 3 | |
| 27 Sept. | Partly cloudy | 13° /9° | 14.4 mm | 4 | |
| 28 Sept. | Cloudy | 13° /8° | 0 mm | 4 | |
| 29 Sept. | Partly cloudy | 15° /8° | 0 mm | 4 | |
| 30 Sept. | Mist | 14° /6° | 0 mm | 4 | |
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Important Notice
Our weather forecast for Bas-Saint-Laurent 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 Bas-Saint-Laurent forecast closer to your planned date for the most up-to-date weather information.
Bas-Saint-Laurent in September - FAQ
What are the expected maximum and minimum temperatures in Bas-Saint-Laurent during September?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Bas-Saint-Laurent during September?
Significant rainfall exceeding 109.4 mm is expected in Bas-Saint-Laurent during September, occurring over more than 12 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Bas-Saint-Laurent during September?
The average wind speed in Bas-Saint-Laurent during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Bas-Saint-Laurent
Explore the daily rainfall trends and prepare for Bas-Saint-Laurents September weather 💧
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