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°
77°
25
105°
74°
26
104°
74°
27
100°
71°
28
100°
70°
29
102°
70°
30
101°
74°
31
102°
74°
1
100°
75°
2
102°
76°
3
101°
76°
4
102°
76°
5
103°
74°
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 100° to 103°, with overnight lows between 74° and 76°. The average high for August is 102° with an average low of 75°. 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.
