S
M
T
W
T
F
S
30
77°
60°
31
80°
65°
1
82°
65°
2
80°
64°
3
77°
62°
4
76°
59°
5
75°
58°
6
75°
56°
7
76°
63°
8
81°
58°
9
73°
55°
10
74°
55°
11
77°
51°
12
72°
54°
13
72°
53°
14
70°
52°
15
72°
54°
16
73°
53°
17
72°
52°
18
76°
53°
19
71°
51°
20
71°
49°
21
69°
49°
22
70°
51°
23
72°
54°
24
76°
50°
25
76°
55°
26
75°
55°
27
69°
52°
28
67°
52°
29
74°
50°
30
72°
46°
1
66°
50°
2
71°
55°
3
73°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Norwalk
Norwalk's September 2026 forecast shows daily high temperatures ranging from 66° to 82°, with overnight lows between 45° and 65°. The average high for September is 74° with an average low of 54°. 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 Norwalk. See also: October | November | December.
