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Weather in Westmount for September 2026

Your guide to Westmount weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Westmount is slightly cooler than the historical average by 0.6 °C.

  • The forecast for the next days in Westmount predicts temperatures to be around 18 °C, close to the historical average.

  • In general, the average temperature in Westmount at the beginning of September is 24.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.6 °C by the end of September.

    • Rain 🌧️

  • The climate of Westmount in September is notably wet, with an average of 14 rainy days, and a total of 160.2 mm of precipitation.

    • More

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

Average dry days
16
Dry days
Average rainy days
14
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/12°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
72 %
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
24°
3
Mist
25°
4
Partly cloudy
26°
5
Mist
25°
6
Mist
24°
7
Patchy light rain with thunder
23°
8
Light rain shower
21°
9
Cloudy
21°
10
Heavy rain
22°
11
Overcast
21°
12
Overcast
23°
13
Moderate rain
21°
14
Overcast
21°
15
Mist
23°
16
Overcast
25°
17
Partly cloudy
26°
18
Sunny
20°
19
Sunny
16°
20
Overcast
18°
21
Overcast
15°
22
Overcast
17°
23
Overcast
18°
24
Overcast
19°
25
Light rain shower
14°
26
Patchy rain possible
10°
27
Sunny
16°
28
Overcast
22°
29
Patchy rain possible
24°
30
Overcast
25°

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° 1.6 mm 5
2 Sept. Mist
Mist
 24° /14° 30.8 mm 5
3 Sept. Mist
Mist
 25° /14° 35.7 mm 5
4 Sept. Partly cloudy
Partly cloudy
 26° /15° 8.9 mm 7
5 Sept. Mist
Mist
 25° /15° 11.6 mm 6
6 Sept. Mist
Mist
 24° /15° 9.9 mm 6
7 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 23° /12° 5.7 mm 5
8 Sept. Light rain shower
Light rain shower
 21° /11° 16.2 mm 4
9 Sept. Cloudy
Cloudy
 21° /9° 4.6 mm 4
10 Sept. Heavy rain
Heavy rain
 22° /11° 2.6 mm 5
11 Sept. Overcast
Overcast
 21° /11° 1.3 mm 6
12 Sept. Overcast
Overcast
 23° /11° 0.7 mm 6
13 Sept. Moderate rain
Moderate rain
 21° /14° 5.6 mm 4
14 Sept. Overcast
Overcast
 21° /12° 0.3 mm 5
15 Sept. Mist
Mist
 23° /11° 0.2 mm 5
16 Sept. Overcast
Overcast
 25° /14° 0 mm 5
17 Sept. Partly cloudy
Partly cloudy
 26° /13° 0 mm 5
18 Sept. Sunny
Sunny
 20° /10° 0 mm 4.8
19 Sept. Sunny
Sunny
 16° /7° 0 mm 4.9
20 Sept. Overcast
Overcast
 18° /9° 0 mm 4.5
21 Sept. Overcast
Overcast
 15° /8° 0 mm 4.8
22 Sept. Overcast
Overcast
 17° /5° 0 mm 5
23 Sept. Overcast
Overcast
 18° /6° 0 mm 5
24 Sept. Overcast
Overcast
 19° /10° 0 mm 4
25 Sept. Light rain shower
Light rain shower
 14° /7° 7 mm 3
26 Sept. Patchy rain possible
Patchy rain possible
 10° /6° 1.5 mm 3
27 Sept. Sunny
Sunny
 16° /7° 0 mm 5
28 Sept. Overcast
Overcast
 22° /13° 0 mm 6
29 Sept. Patchy rain possible
Patchy rain possible
 24° /16° 1.5 mm 6
30 Sept. Overcast
Overcast
 25° /16° 0.5 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 160.2 mm is expected in Westmount during September, occurring over more than 14 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 💧
Typically, Westmount has 14 rainy days in September with a total of 160.2 mm of rainfall.

UV exposure in Westmount during September

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

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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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