S
M
T
W
T
F
S
30
85°
63°
31
81°
64°
1
82°
64°
2
86°
59°
3
86°
54°
4
78°
55°
5
77°
62°
6
83°
58°
7
82°
54°
8
76°
56°
9
75°
58°
10
77°
61°
11
79°
60°
12
84°
60°
13
83°
59°
14
84°
54°
15
82°
52°
16
74°
54°
17
74°
49°
18
75°
49°
19
73°
46°
20
71°
46°
21
70°
48°
22
71°
55°
23
72°
47°
24
74°
53°
25
77°
55°
26
73°
54°
27
78°
55°
28
78°
51°
29
77°
49°
30
70°
49°
1
71°
50°
2
76°
51°
3
74°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lisle
Lisle's September 2026 forecast shows daily high temperatures ranging from 70° to 86°, with overnight lows between 46° and 64°. The average high for September is 77° with an average low of 54°. 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 Lisle. See also: October | November | December.
