S
M
T
W
T
F
S
30
81°
64°
31
81°
64°
1
82°
63°
2
77°
63°
3
79°
62°
4
79°
63°
5
81°
63°
6
81°
62°
7
82°
63°
8
83°
63°
9
80°
62°
10
76°
60°
11
80°
62°
12
81°
62°
13
80°
60°
14
70°
50°
15
69°
53°
16
70°
56°
17
71°
53°
18
68°
51°
19
71°
52°
20
76°
56°
21
76°
56°
22
75°
55°
23
75°
46°
24
68°
46°
25
69°
54°
26
72°
55°
27
73°
45°
28
72°
44°
29
64°
47°
30
66°
51°
1
66°
50°
2
69°
53°
3
73°
53°
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 64° to 83°, with overnight lows between 44° and 64°. The average high for September is 75° with an average low of 56°. 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.
