S
M
T
W
T
F
S
30
84°
69°
31
89°
72°
1
90°
72°
2
94°
73°
3
89°
68°
4
83°
63°
5
81°
62°
6
80°
63°
7
83°
62°
8
83°
63°
9
77°
59°
10
76°
60°
11
76°
56°
12
78°
60°
13
80°
60°
14
80°
61°
15
79°
60°
16
79°
60°
17
78°
59°
18
75°
58°
19
79°
60°
20
80°
61°
21
80°
60°
22
79°
60°
23
80°
59°
24
79°
59°
25
78°
58°
26
77°
56°
27
78°
57°
28
77°
57°
29
76°
56°
30
75°
55°
1
74°
54°
2
75°
55°
3
75°
55°
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 74° to 94°, with overnight lows between 54° and 73°. The average high for September is 80° with an average low of 61°. 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.
