S
M
T
W
T
F
S
30
78°
62°
31
80°
55°
1
80°
53°
2
75°
54°
3
74°
58°
4
77°
63°
5
82°
55°
6
81°
53°
7
74°
53°
8
74°
57°
9
76°
60°
10
75°
57°
11
74°
59°
12
72°
57°
13
72°
51°
14
71°
50°
15
70°
50°
16
71°
54°
17
71°
57°
18
77°
58°
19
79°
58°
20
78°
56°
21
77°
52°
22
74°
55°
23
69°
48°
24
71°
47°
25
67°
46°
26
68°
47°
27
75°
55°
28
76°
55°
29
Hist. Avg.
70°
48°
30
Hist. Avg.
70°
48°
1
Hist. Avg.
70°
48°
2
Hist. Avg.
69°
47°
3
Hist. Avg.
69°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in New Chicago
New Chicago's September 2026 forecast shows daily high temperatures ranging from 67° to 82°, with overnight lows between 46° and 63°. The average high for September is 75° 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 New Chicago. See also: October | November | December.
