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Weather in Rimouski for September 2025

Your guide to Rimouski weather in September - trends and predictions

    Temperatures

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

  • Expect cooler weather in the next days in Rimouski with the forecast suggesting a temperature of 15.5 °C, lower than the historical average.

  • In general, the average temperature in Rimouski at the beginning of September is 18.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.3 °C by the end of September.

    • Rain 🌧️

  • With an average of 5 rainy days, Rimouski 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

Rimouski 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
Overcast
16°
16
Sunny
19°
17
Sunny
19°
18
Sunny
21°
19
Patchy rain possible
11°
20
Sunny
11°
21
Sunny
14°
22
Sunny
17°
23
Partly cloudy
19°
24
Patchy rain possible
18°
25
Patchy rain possible
13°
26
Sunny
13°
27
Sunny
13°
28
Partly cloudy
14°
29
Partly cloudy
15°
30
Mist
14°

Temperatures trend during September in Rimouski

See the weather trend as well as the moving average line

September weather in Rimouski 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. Overcast
Overcast
 16° /9° 0 mm 4
16 Sept. Sunny
Sunny
 19° /10° 0 mm 1
17 Sept. Sunny
Sunny
 19° /13° 0 mm 1.1
18 Sept. Sunny
Sunny
 21° /11° 0 mm 0.8
19 Sept. Patchy rain possible
Patchy rain possible
 11° /7° 0.4 mm 0.7
20 Sept. Sunny
Sunny
 11° /4° 0 mm 0
21 Sept. Sunny
Sunny
 14° /5° 0 mm 3
22 Sept. Sunny
Sunny
 17° /9° 0 mm 4
23 Sept. Partly cloudy
Partly cloudy
 19° /13° 0 mm 5
24 Sept. Patchy rain possible
Patchy rain possible
 18° /11° 1.4 mm 4
25 Sept. Patchy rain possible
Patchy rain possible
 13° /10° 0.2 mm 3
26 Sept. Sunny
Sunny
 13° /8° 0 mm 4
27 Sept. Sunny
Sunny
 13° /8° 0 mm 3
28 Sept. Partly cloudy
Partly cloudy
 14° /6° 0 mm 4
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 Rimouski 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 Rimouski forecast closer to your planned date for the most up-to-date weather information.
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Rimouski in September - FAQ

What are the expected maximum and minimum temperatures in Rimouski 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 Rimouski during September?
Significant rainfall exceeding 206.7 mm is expected in Rimouski during September, occurring over more than 5 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Rimouski during September?
The average wind speed in Rimouski during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Rimouski

Explore the daily rainfall trends and prepare for Rimouskis September weather 💧

UV exposure in Rimouski during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Rimouski?

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

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