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Weather in Rimouski for September 2026

Your guide to Rimouski weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Rimouski has been nearly identical to the historical average, with a temperature of 17.9 °C (showing only a slight deviation of 0.2 °C).

  • Expect cooler weather in the next days in Rimouski with the forecast suggesting a temperature of 13.6 °C, lower than the historical average.

  • In general, the average temperature in Rimouski at the beginning of September is 18.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.1 °C by the end of September.

    • Rain 🌧️

  • Rimouski in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 89.7 mm.

    • More

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

Average dry days
14
Dry days
Average rainy days
16
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/10°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
82 %
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
Overcast
19°
3
Partly cloudy
17°
4
Partly cloudy
19°
5
Fog
19°
6
Fog
19°
7
Fog
19°
8
Sunny
16°
9
Fog
15°
10
Overcast
16°
11
Overcast
12°
12
Sunny
17°
13
Light rain shower
19°
14
Patchy rain possible
13°
15
Overcast
14°
16
Overcast
18°
17
Overcast
15°
18
Overcast
12°
19
Overcast
13°
20
Sunny
11°
21
Sunny
13°
22
Sunny
12°
23
Overcast
10°
24
Sunny
11°
25
Patchy rain possible
13°
26
Mist
14°
27
Partly cloudy
13°
28
Cloudy
14°
29
Partly cloudy
15°
30
Mist
12°

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° /9° 1.2 mm 6
2 Sept. Overcast
Overcast
 19° /10° 0 mm 4
3 Sept. Partly cloudy
Partly cloudy
 17° /12° 28.5 mm 4
4 Sept. Partly cloudy
Partly cloudy
 19° /12° 2.5 mm 4
5 Sept. Fog
Fog
 19° /12° 0 mm 5
6 Sept. Fog
Fog
 19° /11° 5.1 mm 4
7 Sept. Fog
Fog
 19° /10° 4.2 mm 4
8 Sept. Sunny
Sunny
 16° /10° 2 mm 4
9 Sept. Fog
Fog
 15° /8° 0.4 mm 4
10 Sept. Overcast
Overcast
 16° /9° 5.3 mm 3
11 Sept. Overcast
Overcast
 12° /9° 0 mm 3.7
12 Sept. Sunny
Sunny
 17° /8° 0 mm 4.9
13 Sept. Light rain shower
Light rain shower
 19° /13° 18.9 mm 4
14 Sept. Patchy rain possible
Patchy rain possible
 13° /9° 0.5 mm 3.7
15 Sept. Overcast
Overcast
 14° /7° 0 mm 3
16 Sept. Overcast
Overcast
 18° /13° 0.1 mm 4
17 Sept. Overcast
Overcast
 15° /11° 0 mm 4
18 Sept. Overcast
Overcast
 12° /8° 0.9 mm 4
19 Sept. Overcast
Overcast
 13° /8° 0 mm 4
20 Sept. Sunny
Sunny
 11° /6° 0 mm 3
21 Sept. Sunny
Sunny
 13° /8° 0 mm 4
22 Sept. Sunny
Sunny
 12° /7° 0 mm 4
23 Sept. Overcast
Overcast
 10° /7° 9.1 mm 2
24 Sept. Sunny
Sunny
 11° /7° 2.6 mm 4
25 Sept. Patchy rain possible
Patchy rain possible
 13° /7° 7.1 mm 3
26 Sept. Mist
Mist
 14° /8° 17.9 mm 3
27 Sept. Partly cloudy
Partly cloudy
 13° /8° 9.6 mm 4
28 Sept. Cloudy
Cloudy
 14° /7° 0 mm 4
29 Sept. Partly cloudy
Partly cloudy
 15° /8° 0 mm 4
30 Sept. Mist
Mist
 12° /7° 0 mm 3
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 16° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Rimouski during September?
Moderate rainfall is anticipated in Rimouski during September, with a total of 89.7 mm spread over approximately 16 days. Considering plans for rainy days is advisable.

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 💧
Typically, Rimouski has 16 rainy days in September with a total of 89.7 mm of rainfall.

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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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