S
M
T
W
T
F
S
30
80°
67°
31
94°
71°
1
95°
73°
2
96°
72°
3
94°
74°
4
94°
74°
5
88°
72°
6
82°
63°
7
82°
59°
8
86°
59°
9
78°
68°
10
77°
60°
11
82°
57°
12
88°
62°
13
76°
52°
14
72°
48°
15
87°
63°
16
74°
66°
17
85°
68°
18
72°
64°
19
72°
64°
20
69°
60°
21
66°
58°
22
64°
54°
23
67°
57°
24
N/A
25
65°
50°
26
72°
48°
27
N/A
28
N/A
29
N/A
30
67°
63°
1
71°
59°
2
67°
48°
3
66°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in New Lenox
New Lenox's September 2026 forecast shows daily high temperatures ranging from 66° to 71°, 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 New Lenox. See also: October | November | December.
