S
M
T
W
T
F
S
30
81°
56°
31
77°
55°
1
75°
58°
2
74°
57°
3
76°
57°
4
75°
56°
5
74°
56°
6
73°
59°
7
73°
56°
8
74°
55°
9
75°
55°
10
74°
54°
11
73°
54°
12
73°
55°
13
72°
57°
14
72°
56°
15
76°
59°
16
79°
59°
17
80°
58°
18
79°
56°
19
70°
53°
20
78°
57°
21
70°
47°
22
68°
48°
23
Hist. Avg.
74°
56°
24
Hist. Avg.
73°
56°
25
Hist. Avg.
73°
55°
26
Hist. Avg.
73°
55°
27
Hist. Avg.
72°
54°
28
Hist. Avg.
72°
54°
29
Hist. Avg.
71°
53°
30
Hist. Avg.
71°
53°
1
Hist. Avg.
70°
53°
2
Hist. Avg.
70°
52°
3
Hist. Avg.
70°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Oak Forest
Oak Forest's September 2026 forecast shows daily high temperatures ranging from 68° to 81°, with overnight lows between 47° and 59°. The average high for September is 75° with an average low of 56°. 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.
