S
M
T
W
T
F
S
30
81°
66°
31
83°
70°
1
85°
69°
2
81°
64°
3
82°
63°
4
80°
66°
5
80°
61°
6
79°
54°
7
78°
55°
8
75°
55°
9
79°
64°
10
77°
45°
11
78°
56°
12
78°
54°
13
71°
46°
14
70°
60°
15
73°
53°
16
72°
52°
17
70°
50°
18
67°
51°
19
67°
46°
20
67°
47°
21
66°
50°
22
67°
49°
23
69°
45°
24
70°
51°
25
66°
50°
26
73°
51°
27
73°
50°
28
72°
50°
29
71°
49°
30
71°
49°
1
68°
48°
2
64°
48°
3
68°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Custer
Custer's September 2026 forecast shows daily high temperatures ranging from 64° to 78°, with overnight lows between 45° and 60°. The average high for September is 70° with an average low of 50°. 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. See also: October | November | December.
