S
M
T
W
T
F
S
26
86°
66°
27
87°
69°
28
75°
67°
29
78°
68°
30
80°
68°
31
81°
66°
1
82°
68°
2
81°
69°
3
75°
64°
4
82°
63°
5
87°
64°
6
85°
69°
7
85°
71°
8
85°
68°
9
81°
69°
10
80°
67°
11
80°
65°
12
79°
64°
13
78°
64°
14
76°
62°
15
74°
58°
16
73°
61°
17
78°
66°
18
80°
63°
19
73°
61°
20
74°
61°
21
76°
58°
22
81°
57°
23
75°
62°
24
72°
60°
25
75°
61°
26
80°
62°
27
77°
62°
28
72°
57°
29
73°
61°
30
76°
60°
31
73°
61°
1
74°
63°
2
74°
62°
3
76°
64°
4
75°
64°
5
80°
62°
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 72° to 80°, with overnight lows between 57° and 64°. The average high for August is 75° with an average low of 62°. 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.
