S
M
T
W
T
F
S
30
75°
53°
31
77°
58°
1
75°
60°
2
80°
53°
3
76°
49°
4
73°
51°
5
72°
49°
6
73°
53°
7
78°
55°
8
80°
58°
9
81°
57°
10
80°
51°
11
73°
56°
12
73°
53°
13
75°
48°
14
72°
49°
15
71°
48°
16
70°
47°
17
72°
55°
18
75°
45°
19
70°
49°
20
70°
45°
21
72°
48°
22
70°
53°
23
76°
54°
24
77°
53°
25
73°
54°
26
76°
54°
27
75°
53°
28
77°
51°
29
75°
52°
30
73°
53°
1
76°
50°
2
76°
43°
3
73°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Glen Ellyn
Glen Ellyn's September 2026 forecast shows daily high temperatures ranging from 70° to 81°, with overnight lows between 40° and 60°. The average high for September is 75° with an average low of 51°. 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 Glen Ellyn. See also: October | November | December.
