S
M
T
W
T
F
S
30
71°
49°
31
74°
47°
1
72°
48°
2
72°
53°
3
74°
52°
4
72°
52°
5
73°
51°
6
72°
49°
7
74°
51°
8
72°
46°
9
67°
46°
10
69°
49°
11
68°
43°
12
71°
43°
13
65°
41°
14
69°
47°
15
71°
44°
16
70°
40°
17
63°
40°
18
62°
39°
19
62°
40°
20
63°
41°
21
63°
45°
22
64°
42°
23
63°
39°
24
62°
45°
25
64°
41°
26
67°
45°
27
67°
42°
28
66°
36°
29
60°
34°
30
57°
42°
1
58°
44°
2
63°
42°
3
64°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in New Canaan
New Canaan's September 2026 forecast shows daily high temperatures ranging from 57° to 74°, with overnight lows between 34° and 53°. The average high for September is 67° with an average low of 44°. 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 New Canaan. See also: October | November | December.
