S
M
T
W
T
F
S
31
78°
60°
1
74°
59°
2
85°
58°
3
82°
66°
4
82°
64°
5
74°
64°
6
71°
61°
7
73°
60°
8
74°
56°
9
74°
61°
10
70°
62°
11
67°
60°
12
71°
58°
13
78°
55°
14
68°
55°
15
70°
49°
16
82°
59°
17
78°
58°
18
74°
58°
19
78°
55°
20
79°
56°
21
69°
54°
22
72°
51°
23
82°
56°
24
80°
59°
25
71°
52°
26
69°
51°
27
76°
55°
28
72°
54°
29
62°
56°
30
68°
54°
1
61°
54°
2
64°
53°
3
65°
49°
4
65°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Forest Park
Forest Park's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
