S
M
T
W
T
F
S
30
80°
58°
31
88°
49°
1
81°
56°
2
87°
57°
3
88°
54°
4
82°
53°
5
78°
53°
6
83°
55°
7
86°
54°
8
83°
44°
9
82°
44°
10
74°
42°
11
73°
43°
12
73°
47°
13
75°
43°
14
74°
40°
15
72°
41°
16
71°
41°
17
71°
39°
18
70°
39°
19
69°
40°
20
70°
41°
21
72°
45°
22
77°
48°
23
79°
48°
24
74°
47°
25
79°
45°
26
76°
46°
27
71°
41°
28
77°
38°
29
67°
37°
30
66°
46°
1
67°
38°
2
66°
47°
3
75°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Belle Fourche
Belle Fourche's September 2026 forecast shows daily high temperatures ranging from 66° to 88°, with overnight lows between 34° and 58°. The average high for September is 76° with an average low of 46°. 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 Belle Fourche. See also: October | November | December.
