S
M
T
W
T
F
S
26
83°
65°
27
83°
65°
28
82°
64°
29
82°
62°
30
80°
61°
31
74°
58°
1
73°
56°
2
73°
55°
3
74°
58°
4
75°
62°
5
77°
62°
6
77°
61°
7
78°
62°
8
75°
60°
9
75°
60°
10
75°
54°
11
75°
53°
12
77°
62°
13
76°
63°
14
83°
61°
15
82°
59°
16
78°
62°
17
82°
58°
18
78°
55°
19
77°
52°
20
71°
51°
21
72°
50°
22
72°
51°
23
76°
52°
24
78°
53°
25
78°
52°
26
79°
54°
27
80°
59°
28
80°
55°
29
78°
57°
30
79°
58°
31
78°
51°
1
77°
47°
2
70°
48°
3
69°
54°
4
73°
57°
5
75°
55°
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 69° to 83°, with overnight lows between 47° and 65°. The average high for August is 77° with an average low of 57°. 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.
