S
M
T
W
T
F
S
30
76°
56°
31
75°
56°
1
76°
60°
2
76°
64°
3
77°
64°
4
83°
65°
5
83°
63°
6
82°
56°
7
79°
56°
8
77°
57°
9
75°
54°
10
74°
55°
11
74°
55°
12
72°
56°
13
77°
58°
14
79°
60°
15
77°
60°
16
72°
56°
17
74°
57°
18
73°
59°
19
76°
51°
20
74°
54°
21
73°
51°
22
76°
49°
23
70°
49°
24
70°
50°
25
69°
55°
26
69°
49°
27
70°
54°
28
69°
54°
29
67°
47°
30
68°
48°
1
67°
54°
2
73°
49°
3
71°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in South Norwalk
South Norwalk's September 2026 forecast shows daily high temperatures ranging from 67° to 83°, with overnight lows between 47° and 65°. The average high for September is 74° with an average low of 55°. 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 South Norwalk. See also: October | November | December.
