S
M
T
W
T
F
S
30
81°
56°
31
82°
54°
1
78°
53°
2
78°
53°
3
77°
58°
4
77°
54°
5
81°
52°
6
77°
50°
7
76°
51°
8
75°
52°
9
76°
52°
10
79°
57°
11
79°
56°
12
77°
55°
13
Hist. Avg.
76°
56°
14
Hist. Avg.
76°
55°
15
Hist. Avg.
76°
55°
16
Hist. Avg.
76°
54°
17
Hist. Avg.
75°
54°
18
Hist. Avg.
75°
54°
19
Hist. Avg.
74°
53°
20
Hist. Avg.
74°
53°
21
Hist. Avg.
74°
53°
22
Hist. Avg.
73°
52°
23
Hist. Avg.
73°
52°
24
Hist. Avg.
72°
51°
25
Hist. Avg.
72°
51°
26
Hist. Avg.
72°
50°
27
Hist. Avg.
71°
50°
28
Hist. Avg.
71°
50°
29
Hist. Avg.
70°
49°
30
Hist. Avg.
70°
49°
1
Hist. Avg.
70°
48°
2
Hist. Avg.
69°
48°
3
Hist. Avg.
69°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Forest Park
Forest Park's September 2026 forecast shows daily high temperatures ranging from 75° to 82°, with overnight lows between 50° and 58°. The average high for September is 78° 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 Forest Park. See also: October | November | December.
