S
M
T
W
T
F
S
30
74°
62°
31
74°
61°
1
75°
63°
2
77°
65°
3
75°
65°
4
82°
66°
5
82°
65°
6
80°
64°
7
78°
63°
8
74°
62°
9
75°
63°
10
73°
63°
11
75°
62°
12
75°
61°
13
78°
61°
14
78°
62°
15
79°
61°
16
78°
61°
17
76°
60°
18
76°
61°
19
74°
60°
20
76°
60°
21
79°
56°
22
79°
53°
23
78°
47°
24
70°
46°
25
73°
53°
26
77°
49°
27
72°
56°
28
76°
58°
29
78°
58°
30
77°
53°
1
78°
46°
2
68°
54°
3
66°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Oak Forest
Oak Forest's September 2026 forecast shows daily high temperatures ranging from 66° to 82°, with overnight lows between 46° and 66°. The average high for September is 76° with an average low of 59°. 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 Oak Forest. See also: October | November | December.
