S
M
T
W
T
F
S
26
83°
63°
27
82°
61°
28
80°
60°
29
80°
60°
30
77°
55°
31
74°
58°
1
73°
58°
2
72°
60°
3
79°
60°
4
79°
59°
5
75°
59°
6
72°
58°
7
72°
56°
8
73°
58°
9
74°
58°
10
72°
59°
11
79°
60°
12
79°
58°
13
78°
56°
14
79°
59°
15
78°
58°
16
80°
50°
17
72°
49°
18
69°
48°
19
69°
49°
20
70°
50°
21
71°
50°
22
72°
51°
23
72°
51°
24
73°
57°
25
76°
56°
26
74°
49°
27
69°
49°
28
68°
51°
29
76°
56°
30
76°
55°
31
75°
47°
1
69°
46°
2
67°
52°
3
68°
54°
4
75°
48°
5
75°
44°
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 67° to 83°, with overnight lows between 44° and 63°. The average high for August is 74° with an average low of 55°. 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.
