S
M
T
W
T
F
S
26
92°
72°
27
92°
72°
28
91°
71°
29
93°
72°
30
94°
72°
31
93°
71°
1
93°
73°
2
95°
72°
3
93°
71°
4
93°
72°
5
94°
72°
6
94°
73°
7
93°
71°
8
92°
70°
9
93°
71°
10
87°
69°
11
89°
70°
12
92°
69°
13
91°
70°
14
92°
71°
15
91°
70°
16
92°
70°
17
92°
62°
18
91°
61°
19
83°
59°
20
82°
60°
21
82°
60°
22
83°
61°
23
83°
62°
24
84°
61°
25
84°
61°
26
87°
65°
27
86°
59°
28
83°
59°
29
83°
61°
30
87°
62°
31
88°
62°
1
88°
59°
2
82°
60°
3
81°
65°
4
85°
66°
5
83°
62°
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 81° to 95°, with overnight lows between 59° and 73°. The average high for August is 89° with an average low of 66°. 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.
