S
M
T
W
T
F
S
26
86°
66°
27
82°
67°
28
81°
66°
29
75°
63°
30
74°
63°
31
81°
67°
1
82°
69°
2
80°
66°
3
79°
64°
4
80°
67°
5
84°
68°
6
83°
67°
7
79°
66°
8
80°
67°
9
82°
68°
10
77°
62°
11
77°
62°
12
79°
61°
13
79°
62°
14
78°
61°
15
75°
60°
16
77°
61°
17
79°
61°
18
79°
60°
19
74°
60°
20
75°
59°
21
72°
57°
22
73°
60°
23
76°
56°
24
76°
52°
25
68°
53°
26
70°
59°
27
73°
59°
28
74°
58°
29
74°
57°
30
69°
52°
31
67°
51°
1
67°
52°
2
66°
52°
3
67°
49°
4
67°
52°
5
71°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Montreal
Montreal's August 2026 forecast shows daily high temperatures ranging from 66° to 84°, with overnight lows between 49° and 69°. The average high for August is 76° with an average low of 60°. 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 Montreal. See also: September | October | November.
