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Weather in Longueuil for September 2025

Your guide to Longueuil weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Longueuil is slightly cooler than the historical average by -1 °C.

  • The forecast for the next days in Longueuil predicts temperatures to be around 24 °C, close to the historical average.

  • In general, the average temperature in Longueuil at the beginning of September is 25 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 22.3 °C by the end of September.

    • Rain 🌧️

  • Longueuil experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 163.6 mm.

    • More

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

Average dry days
21
Dry days
Average rainy days
9
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/12°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
73 %
Avg humidity

Longueuil Weather September

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

Temperatures trend during September in Longueuil

See the weather trend as well as the moving average line

September weather in Longueuil day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Mist
Mist
 25° /11° 1.2 mm 5
2 Sept. Mist
Mist
 23° /13° 0 mm 5
3 Sept. Mist
Mist
 25° /14° 0 mm 6
4 Sept. Partly cloudy
Partly cloudy
 27° /14° 5.1 mm 7
5 Sept. Mist
Mist
 27° /15° 9.7 mm 6
6 Sept. Mist
Mist
 25° /16° 13.2 mm 6
7 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 23° /13° 6.5 mm 5
8 Sept. Light rain shower
Light rain shower
 20° /11° 15 mm 5
9 Sept. Overcast
Overcast
 21° /8° 0 mm 5
10 Sept. Light rain shower
Light rain shower
 22° /11° 4.5 mm 5
11 Sept. Overcast
Overcast
 22° /12° 2.7 mm 5
12 Sept. Overcast
Overcast
 23° /11° 0.4 mm 6
13 Sept. Moderate rain
Moderate rain
 21° /13° 5.5 mm 5
14 Sept. Overcast
Overcast
 21° /13° 0.4 mm 5
15 Sept. Mist
Mist
 24° /12° 0 mm 6
16 Sept. Sunny
Sunny
 27° /10° 0 mm 1.2
17 Sept. Sunny
Sunny
 28° /11° 0 mm 1.1
18 Sept. Moderate rain
Moderate rain
 26° /16° 7.6 mm 1.1
19 Sept. Moderate rain
Moderate rain
 19° /11° 13.2 mm 1.1
20 Sept. Sunny
Sunny
 19° /7° 0 mm 0
21 Sept. Sunny
Sunny
 24° /7° 0 mm 5
22 Sept. Patchy rain possible
Patchy rain possible
 28° /15° 1.6 mm 5
23 Sept. Patchy rain possible
Patchy rain possible
 30° /17° 1 mm 5
24 Sept. Sunny
Sunny
 27° /18° 0 mm 6
25 Sept. Sunny
Sunny
 23° /12° 0 mm 5
26 Sept. Sunny
Sunny
 17° /6° 0 mm 4
27 Sept. Sunny
Sunny
 19° /12° 0 mm 4
28 Sept. Sunny
Sunny
 24° /10° 0 mm 5
29 Sept. Sunny
Sunny
 22° /10° 0 mm 5
30 Sept. Mist
Mist
 24° /10° 0 mm 6
Next
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.
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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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Location coordinates Where is Longueuil?

Get accurate weather forecasts for Longueuil, located at latitude 45.531 and longitude -73.518. Stay updated with localized weather information tailored for Longueuil.

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