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Bas-Saint-Laurent (Rimouski)
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Weather in Bas-Saint-Laurent for September 2025

Your guide to Bas-Saint-Laurent weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Bas-Saint-Laurent is slightly cooler than the historical average by -0.8 °C.

  • Expect cooler weather in the next days in Bas-Saint-Laurent with the forecast suggesting a temperature of 15.6 °C, lower than the historical average.

  • In general, the average temperature in Bas-Saint-Laurent at the beginning of September is 18.7 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 15.9 °C by the end of September.

    • Rain 🌧️

  • With an average of 5 rainy days, Bas-Saint-Laurent experiences minimal rainfall in September.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
25
Dry days
Average rainy days
5
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/8°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
84 %
Avg humidity

Bas-Saint-Laurent Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
20°
2
Cloudy
18°
3
Partly cloudy
17°
4
Partly cloudy
20°
5
Fog
20°
6
Fog
19°
7
Fog
17°
8
Light rain shower
16°
9
Fog
15°
10
Overcast
15°
11
Fog
15°
12
Partly cloudy
16°
13
Moderate rain
16°
14
Moderate rain
15°
15
Partly cloudy
17°
16
Sunny
19°
17
Partly cloudy
17°
18
Patchy rain possible
19°
19
Patchy rain possible
11°
20
Partly cloudy
10°
21
Partly cloudy
13°
22
Cloudy
15°
23
Partly cloudy
16°
24
Patchy rain possible
17°
25
Sunny
15°
26
Partly cloudy
18°
27
Sunny
19°
28
Sunny
13°
29
Partly cloudy
15°
30
Mist
14°

Temperatures trend during September in Bas-Saint-Laurent

See the weather trend as well as the moving average line

September weather in Bas-Saint-Laurent day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Sunny
Sunny
 20° /10° 1.6 mm 5
2 Sept. Cloudy
Cloudy
 18° /11° 0 mm 4
3 Sept. Partly cloudy
Partly cloudy
 17° /12° 0 mm 4
4 Sept. Partly cloudy
Partly cloudy
 20° /12° 0 mm 5
5 Sept. Fog
Fog
 20° /13° 0 mm 5
6 Sept. Fog
Fog
 19° /12° 6.8 mm 5
7 Sept. Fog
Fog
 17° /11° 5.5 mm 4
8 Sept. Light rain shower
Light rain shower
 16° /10° 2.4 mm 4
9 Sept. Fog
Fog
 15° /9° 0.5 mm 4
10 Sept. Overcast
Overcast
 15° /9° 0.2 mm 3
11 Sept. Fog
Fog
 15° /9° 0.4 mm 4
12 Sept. Partly cloudy
Partly cloudy
 16° /9° 0 mm 4
13 Sept. Moderate rain
Moderate rain
 16° /10° 7.6 mm 4
14 Sept. Moderate rain
Moderate rain
 15° /9° 4.1 mm 3
15 Sept. Partly cloudy
Partly cloudy
 17° /10° 0 mm 1
16 Sept. Sunny
Sunny
 19° /10° 0 mm 1.1
17 Sept. Partly cloudy
Partly cloudy
 17° /13° 0 mm 1.2
18 Sept. Patchy rain possible
Patchy rain possible
 19° /12° 1.2 mm 1
19 Sept. Patchy rain possible
Patchy rain possible
 11° /8° 0.6 mm 0
20 Sept. Partly cloudy
Partly cloudy
 10° /5° 0 mm 3
21 Sept. Partly cloudy
Partly cloudy
 13° /4° 0 mm 3
22 Sept. Cloudy
Cloudy
 15° /12° 0 mm 3
23 Sept. Partly cloudy
Partly cloudy
 16° /10° 0 mm 4
24 Sept. Patchy rain possible
Patchy rain possible
 17° /12° 0.9 mm 3
25 Sept. Sunny
Sunny
 15° /9° 0 mm 4
26 Sept. Partly cloudy
Partly cloudy
 18° /10° 0 mm 4
27 Sept. Sunny
Sunny
 19° /10° 0 mm 5
28 Sept. Sunny
Sunny
 13° /8° 0 mm 3
29 Sept. Partly cloudy
Partly cloudy
 15° /8° 0 mm 4
30 Sept. Mist
Mist
 14° /6° 0 mm 4
Next
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.
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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 18° and cooler nights around 8°. 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 206.7 mm is expected in Bas-Saint-Laurent during September, occurring over more than 5 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 18 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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Location coordinates Where is Bas-Saint-Laurent?

Get accurate weather forecasts for Bas-Saint-Laurent, located at latitude 48.449 and longitude -68.524. Stay updated with localized weather information tailored for Bas-Saint-Laurent.

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