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Canada weather

Weather in Westmount for September 2025

Your guide to Westmount weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Westmount is slightly cooler than the historical average by -0.9 °C.

  • The forecast for the upcoming days in Westmount predicts a temperature of 24.1 °C, which is slightly above the historical average.

  • In general, the average temperature in Westmount at the beginning of September is 24.7 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 22.7 °C by the end of September.

    • Rain 🌧️

  • Westmount experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 149.1 mm.

    • More

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

Average dry days
20
Dry days
Average rainy days
10
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

Westmount 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
24°
4
Partly cloudy
27°
5
Mist
27°
6
Mist
25°
7
Patchy light rain with thunder
22°
8
Light rain shower
20°
9
Cloudy
21°
10
Heavy rain
22°
11
Overcast
22°
12
Overcast
23°
13
Moderate rain
20°
14
Overcast
21°
15
Sunny
25°
16
Sunny
26°
17
Partly cloudy
26°
18
Partly cloudy
29°
19
Sunny
20°
20
Sunny
19°
21
Sunny
24°
22
Sunny
26°
23
Sunny
28°
24
Sunny
27°
25
Patchy rain possible
21°
26
Moderate rain
21°
27
Sunny
21°
28
Sunny
24°
29
Mist
21°
30
Mist
24°

Temperatures trend during September in Westmount

See the weather trend as well as the moving average line

September weather in Westmount day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Mist
Mist
 25° /12° 2.1 mm 5
2 Sept. Mist
Mist
 23° /13° 0 mm 5
3 Sept. Mist
Mist
 24° /13° 0 mm 6
4 Sept. Partly cloudy
Partly cloudy
 27° /15° 5.1 mm 7
5 Sept. Mist
Mist
 27° /15° 6.9 mm 6
6 Sept. Mist
Mist
 25° /16° 13.2 mm 6
7 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 22° /13° 7.7 mm 5
8 Sept. Light rain shower
Light rain shower
 20° /11° 13.9 mm 5
9 Sept. Cloudy
Cloudy
 21° /8° 0 mm 5
10 Sept. Heavy rain
Heavy rain
 22° /11° 3.2 mm 5
11 Sept. Overcast
Overcast
 22° /12° 1.8 mm 5
12 Sept. Overcast
Overcast
 23° /12° 1 mm 5
13 Sept. Moderate rain
Moderate rain
 20° /13° 5.1 mm 5
14 Sept. Overcast
Overcast
 21° /13° 0.4 mm 5
15 Sept. Sunny
Sunny
 25° /12° 0 mm 1.2
16 Sept. Sunny
Sunny
 26° /10° 0 mm 1.2
17 Sept. Partly cloudy
Partly cloudy
 26° /12° 0 mm 1.2
18 Sept. Partly cloudy
Partly cloudy
 29° /18° 0 mm 1.2
19 Sept. Sunny
Sunny
 20° /10° 0 mm 0
20 Sept. Sunny
Sunny
 19° /7° 0 mm 4
21 Sept. Sunny
Sunny
 24° /9° 0 mm 5
22 Sept. Sunny
Sunny
 26° /15° 0 mm 6
23 Sept. Sunny
Sunny
 28° /16° 0 mm 6
24 Sept. Sunny
Sunny
 27° /16° 0 mm 6
25 Sept. Patchy rain possible
Patchy rain possible
 21° /16° 0.4 mm 4
26 Sept. Moderate rain
Moderate rain
 21° /15° 5.2 mm 4
27 Sept. Sunny
Sunny
 21° /15° 0 mm 5
28 Sept. Sunny
Sunny
 24° /15° 0 mm 5
29 Sept. Mist
Mist
 21° /10° 0 mm 5
30 Sept. Mist
Mist
 24° /10° 0 mm 6
Next
Important Notice
Our weather forecast for Westmount 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 Westmount forecast closer to your planned date for the most up-to-date weather information.
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Westmount in September - FAQ

What are the expected maximum and minimum temperatures in Westmount 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 Westmount during September?
Significant rainfall exceeding 149.1 mm is expected in Westmount during September, occurring over more than 10 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Westmount during September?
The average wind speed in Westmount during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Westmount

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

UV exposure in Westmount during September

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

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Location coordinates Where is Westmount?

Get accurate weather forecasts for Westmount, located at latitude 45.483 and longitude -73.599. Stay updated with localized weather information tailored for Westmount.

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