S
M
T
W
T
F
S
30
83°
68°
31
87°
70°
1
93°
70°
2
93°
73°
3
85°
71°
4
90°
70°
5
79°
66°
6
74°
59°
7
75°
59°
8
79°
64°
9
78°
67°
10
77°
58°
11
77°
55°
12
85°
61°
13
70°
50°
14
69°
46°
15
79°
63°
16
71°
62°
17
70°
64°
18
69°
62°
19
72°
63°
20
69°
59°
21
64°
54°
22
62°
52°
23
64°
55°
24
67°
52°
25
69°
56°
26
68°
55°
27
70°
55°
28
71°
56°
29
70°
54°
30
71°
55°
1
68°
48°
2
65°
54°
3
62°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Waukegan
Waukegan's September 2026 forecast shows daily high temperatures ranging from 62° to 72°, with overnight lows between 48° and 63°. The average high for September is 68° 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 Waukegan. See also: October | November | December.
