S
M
T
W
T
F
S
26
102°
80°
27
101°
79°
28
104°
77°
29
101°
78°
30
99°
77°
31
99°
79°
1
90°
72°
2
93°
70°
3
96°
70°
4
100°
72°
5
103°
75°
6
102°
77°
7
103°
75°
8
100°
73°
9
100°
73°
10
102°
77°
11
102°
76°
12
103°
78°
13
104°
79°
14
104°
77°
15
103°
75°
16
106°
79°
17
100°
78°
18
109°
75°
19
109°
77°
20
106°
77°
21
102°
76°
22
100°
74°
23
99°
72°
24
85°
75°
25
103°
76°
26
97°
75°
27
97°
71°
28
97°
72°
29
98°
74°
30
100°
76°
31
99°
72°
1
97°
72°
2
94°
71°
3
92°
69°
4
95°
69°
5
93°
70°
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 85° to 103°, with overnight lows between 69° and 76°. The average high for August is 96° with an average low of 72°. 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.
