S
M
T
W
T
F
S
30
81°
68°
31
93°
72°
1
97°
75°
2
99°
79°
3
95°
79°
4
95°
77°
5
84°
73°
6
79°
70°
7
82°
61°
8
87°
70°
9
81°
68°
10
78°
55°
11
79°
60°
12
85°
66°
13
79°
67°
14
84°
68°
15
74°
57°
16
71°
54°
17
73°
55°
18
69°
50°
19
70°
49°
20
68°
53°
21
72°
52°
22
69°
57°
23
70°
56°
24
76°
57°
25
77°
57°
26
77°
56°
27
76°
57°
28
77°
58°
29
77°
58°
30
76°
57°
1
74°
53°
2
74°
48°
3
62°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in New Chicago
New Chicago's September 2026 forecast shows daily high temperatures ranging from 62° to 87°, with overnight lows between 46° and 70°. The average high for September is 75° with an average low of 57°. 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.
