S
M
T
W
T
F
S
30
100°
73°
31
102°
75°
1
101°
72°
2
100°
77°
3
100°
77°
4
100°
75°
5
100°
72°
6
100°
73°
7
97°
72°
8
102°
73°
9
99°
70°
10
81°
66°
11
86°
64°
12
90°
63°
13
84°
66°
14
97°
68°
15
99°
73°
16
98°
74°
17
97°
72°
18
96°
73°
19
94°
72°
20
87°
67°
21
81°
62°
22
82°
63°
23
79°
62°
24
77°
58°
25
79°
59°
26
83°
61°
27
86°
62°
28
86°
62°
29
77°
53°
30
79°
61°
1
79°
60°
2
78°
59°
3
75°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Harry S Truman State Park
Harry S Truman State Park's September 2026 forecast shows daily high temperatures ranging from 75° to 98°, with overnight lows between 53° and 74°. The average high for September is 84° with an average low of 63°. 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 Harry S Truman State Park. See also: October | November | December.
