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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Westmount, QC
Content continues below
September
Average Temperature
High
21°
Feels 21
Low
12°
Feels 12
Average Precipitation
10 Days
Rain amount
70.5mm
Snow amount
0cm
Content continues below
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
25°
3
24°
4
23°
5
21°
6
23°
7
24°
8
21°
9
22°
10
22°
11
20°
12
20°
13
21°
14
21°
15
21°
16
21°
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Forecast
Wednesday, September 2, 2026
Day
25°
Feels 30
Wind
28 km/h SE
Gust
41 km/h
Humidity
63%
P.O.P
40%
Rain
<1 mm
Night
18°
Feels 18
Wind
28 km/h S
Gust
41 km/h
Humidity
100%
P.O.P
100%
Rain
25-30 mm
Historical Averages
Sep 2
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.