S
M
T
W
T
F
S
26
78°
64°
27
79°
64°
28
77°
63°
29
80°
64°
30
77°
63°
31
77°
62°
1
79°
63°
2
80°
64°
3
76°
63°
4
79°
62°
5
74°
60°
6
78°
61°
7
80°
60°
8
75°
56°
9
72°
56°
10
73°
55°
11
73°
59°
12
74°
56°
13
74°
63°
14
77°
64°
15
81°
62°
16
72°
61°
17
73°
54°
18
73°
54°
19
74°
58°
20
77°
59°
21
73°
54°
22
74°
52°
23
76°
51°
24
72°
51°
25
72°
52°
26
75°
52°
27
77°
53°
28
76°
54°
29
78°
59°
30
78°
59°
31
77°
58°
1
78°
59°
2
78°
57°
3
76°
50°
4
68°
48°
5
67°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Montréal-Ouest
Montréal-Ouest's August 2026 forecast shows daily high temperatures ranging from 67° to 81°, with overnight lows between 48° and 64°. The average high for August is 76° with an average low of 58°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Montréal-Ouest. See also: September | October | November.
