S
M
T
W
T
F
S
26
98°
76°
27
98°
76°
28
97°
75°
29
96°
75°
30
95°
74°
31
95°
74°
1
94°
75°
2
96°
75°
3
95°
74°
4
96°
75°
5
96°
73°
6
90°
74°
7
92°
74°
8
89°
73°
9
90°
70°
10
90°
70°
11
91°
72°
12
91°
73°
13
95°
74°
14
96°
74°
15
97°
73°
16
97°
74°
17
96°
74°
18
97°
73°
19
98°
75°
20
98°
74°
21
90°
63°
22
88°
64°
23
88°
65°
24
89°
66°
25
91°
70°
26
93°
69°
27
95°
71°
28
95°
70°
29
93°
70°
30
95°
69°
31
95°
70°
1
94°
69°
2
95°
70°
3
95°
70°
4
94°
71°
5
94°
69°
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 88° to 98°, with overnight lows between 63° and 76°. The average high for August is 94° 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.
