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°
70°
9
81°
62°
10
78°
56°
11
79°
62°
12
81°
59°
13
75°
67°
14
80°
67°
15
72°
57°
16
70°
56°
17
74°
57°
18
70°
53°
19
71°
52°
20
68°
53°
21
72°
52°
22
67°
57°
23
70°
56°
24
75°
57°
25
76°
57°
26
75°
56°
27
75°
57°
28
76°
58°
29
76°
58°
30
75°
57°
1
73°
51°
2
68°
46°
3
61°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Gurnee
Gurnee's September 2026 forecast shows daily high temperatures ranging from 61° to 81°, with overnight lows between 42° and 70°. 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 Gurnee. See also: October | November | December.
