S
M
T
W
T
F
S
30
84°
64°
31
79°
61°
1
81°
55°
2
84°
57°
3
84°
57°
4
95°
63°
5
86°
59°
6
93°
65°
7
92°
61°
8
85°
60°
9
69°
49°
10
70°
48°
11
72°
51°
12
75°
52°
13
69°
53°
14
72°
54°
15
74°
55°
16
74°
55°
17
71°
51°
18
70°
52°
19
67°
47°
20
66°
46°
21
67°
52°
22
68°
51°
23
72°
52°
24
73°
52°
25
72°
51°
26
71°
52°
27
71°
51°
28
70°
52°
29
71°
50°
30
69°
46°
1
66°
45°
2
67°
46°
3
69°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Châteaugay
Châteaugay's September 2026 forecast shows daily high temperatures ranging from 66° to 93°, with overnight lows between 45° and 65°. The average high for September is 72° with an average low of 52°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Châteaugay. See also: October | November | December.
