S
M
T
W
T
F
S
30
65°
43°
31
64°
43°
1
63°
44°
2
64°
41°
3
65°
45°
4
66°
45°
5
65°
44°
6
64°
43°
7
63°
42°
8
61°
43°
9
62°
44°
10
62°
46°
11
66°
44°
12
61°
44°
13
63°
37°
14
61°
37°
15
60°
39°
16
62°
44°
17
65°
45°
18
66°
45°
19
66°
44°
20
65°
46°
21
64°
45°
22
65°
44°
23
64°
40°
24
63°
39°
25
57°
40°
26
59°
36°
27
60°
37°
28
59°
36°
29
53°
36°
30
53°
34°
1
Hist. Avg.
58°
37°
2
Hist. Avg.
57°
37°
3
Hist. Avg.
57°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Cap-aux-Os
Cap-aux-Os's September 2026 forecast shows daily high temperatures ranging from 53° to 66°, with overnight lows between 34° and 46°. The average high for September is 62° with an average low of 42°. 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 Cap-aux-Os. See also: October | November | December.
