S
M
T
W
T
F
S
30
79°
63°
31
80°
55°
1
80°
53°
2
73°
54°
3
74°
59°
4
76°
63°
5
81°
54°
6
81°
53°
7
73°
53°
8
73°
59°
9
75°
60°
10
76°
58°
11
73°
58°
12
71°
57°
13
72°
51°
14
70°
49°
15
70°
51°
16
71°
54°
17
70°
57°
18
77°
57°
19
78°
58°
20
77°
56°
21
76°
53°
22
73°
55°
23
68°
48°
24
69°
47°
25
66°
47°
26
67°
47°
27
74°
55°
28
75°
55°
29
Hist. Avg.
69°
49°
30
Hist. Avg.
68°
48°
1
Hist. Avg.
68°
48°
2
Hist. Avg.
67°
48°
3
Hist. Avg.
67°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in North Chicago
North Chicago's September 2026 forecast shows daily high temperatures ranging from 66° to 81°, with overnight lows between 47° and 63°. The average high for September is 74° 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 North Chicago. See also: October | November | December.
