S
M
T
W
T
F
S
26
80°
64°
27
82°
62°
28
79°
60°
29
75°
60°
30
81°
63°
31
76°
59°
1
80°
63°
2
82°
59°
3
77°
54°
4
75°
55°
5
76°
58°
6
75°
56°
7
81°
57°
8
76°
55°
9
78°
56°
10
81°
62°
11
81°
55°
12
80°
58°
13
79°
64°
14
83°
64°
15
79°
58°
16
81°
53°
17
73°
52°
18
72°
54°
19
74°
54°
20
72°
55°
21
70°
54°
22
71°
60°
23
72°
62°
24
79°
60°
25
81°
53°
26
78°
50°
27
70°
50°
28
70°
51°
29
69°
53°
30
70°
59°
31
75°
61°
1
78°
60°
2
78°
56°
3
75°
50°
4
75°
57°
5
76°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Châteauguay
Châteauguay's August 2026 forecast shows daily high temperatures ranging from 69° to 83°, with overnight lows between 49° and 64°. The average high for August is 77° with an average low of 57°. 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 Châteauguay. See also: September | October | November.
