S
M
T
W
T
F
S
30
79°
59°
31
80°
57°
1
80°
52°
2
78°
51°
3
79°
50°
4
72°
54°
5
78°
54°
6
79°
55°
7
78°
48°
8
71°
46°
9
69°
50°
10
71°
55°
11
76°
47°
12
76°
55°
13
76°
53°
14
75°
54°
15
75°
55°
16
68°
48°
17
69°
46°
18
69°
43°
19
Hist. Avg.
71°
47°
20
Hist. Avg.
71°
47°
21
Hist. Avg.
70°
46°
22
Hist. Avg.
70°
46°
23
Hist. Avg.
70°
45°
24
Hist. Avg.
69°
45°
25
Hist. Avg.
69°
44°
26
Hist. Avg.
68°
44°
27
Hist. Avg.
68°
43°
28
Hist. Avg.
67°
43°
29
Hist. Avg.
67°
42°
30
Hist. Avg.
66°
42°
1
Hist. Avg.
66°
42°
2
Hist. Avg.
66°
41°
3
Hist. Avg.
65°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Norwalk
Norwalk's September 2026 forecast shows daily high temperatures ranging from 68° to 80°, with overnight lows between 43° and 59°. The average high for September is 75° with an average low of 52°. 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.
