S
M
T
W
T
F
S
30
91°
73°
31
94°
74°
1
95°
73°
2
95°
73°
3
94°
72°
4
91°
75°
5
95°
73°
6
93°
73°
7
88°
70°
8
88°
71°
9
90°
70°
10
92°
71°
11
92°
68°
12
86°
67°
13
86°
65°
14
87°
66°
15
86°
70°
16
80°
69°
17
80°
67°
18
83°
69°
19
81°
68°
20
78°
65°
21
81°
64°
22
80°
64°
23
81°
63°
24
84°
67°
25
84°
67°
26
78°
65°
27
76°
66°
28
76°
66°
29
77°
65°
30
79°
65°
1
75°
64°
2
75°
64°
3
76°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Forest Park
Forest Park's September 2026 forecast shows daily high temperatures ranging from 75° to 95°, with overnight lows between 63° and 75°. The average high for September is 84° with an average low of 68°. 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.
