S
M
T
W
T
F
S
30
74°
49°
31
80°
45°
1
73°
44°
2
69°
43°
3
68°
43°
4
70°
45°
5
71°
49°
6
77°
55°
7
80°
45°
8
76°
45°
9
69°
44°
10
69°
44°
11
70°
51°
12
78°
42°
13
68°
43°
14
68°
52°
15
77°
52°
16
80°
43°
17
73°
41°
18
66°
44°
19
67°
42°
20
73°
46°
21
65°
48°
22
74°
52°
23
76°
38°
24
76°
38°
25
63°
47°
26
65°
47°
27
73°
49°
28
69°
49°
29
73°
48°
30
74°
43°
1
73°
36°
2
69°
37°
3
59°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Custer State Park Headquarters
Custer State Park Headquarters's September 2026 forecast shows daily high temperatures ranging from 59° to 80°, with overnight lows between 34° and 55°. The average high for September is 72° with an average low of 45°. 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 Custer State Park Headquarters. See also: October | November | December.
