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
88°
63°
9
81°
70°
10
77°
59°
11
81°
64°
12
86°
67°
13
77°
56°
14
77°
69°
15
85°
65°
16
73°
62°
17
74°
58°
18
71°
56°
19
67°
51°
20
70°
51°
21
69°
52°
22
74°
55°
23
75°
55°
24
72°
51°
25
70°
56°
26
76°
57°
27
76°
57°
28
75°
56°
29
75°
56°
30
74°
54°
1
72°
51°
2
68°
54°
3
73°
54°
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 67° to 86°, with overnight lows between 51° and 69°. The average high for September is 74° 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.
