S
M
T
W
T
F
S
26
75°
56°
27
76°
55°
28
73°
54°
29
75°
55°
30
75°
55°
31
76°
54°
1
77°
59°
2
79°
60°
3
74°
60°
4
75°
59°
5
75°
55°
6
76°
55°
7
75°
56°
8
78°
55°
9
76°
53°
10
74°
53°
11
77°
54°
12
79°
58°
13
73°
56°
14
72°
56°
15
74°
58°
16
73°
53°
17
73°
59°
18
79°
59°
19
80°
58°
20
81°
59°
21
81°
59°
22
79°
58°
23
79°
57°
24
78°
52°
25
71°
51°
26
69°
57°
27
71°
53°
28
70°
50°
29
71°
57°
30
74°
58°
31
75°
51°
1
75°
49°
2
69°
49°
3
72°
56°
4
Hist. Avg.
72°
51°
5
Hist. Avg.
72°
51°
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 81°, with overnight lows between 49° and 60°. The average high for August is 75° with an average low of 56°. 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.
