S
M
T
W
T
F
S
30
85°
61°
31
87°
60°
1
82°
57°
2
81°
58°
3
89°
60°
4
90°
61°
5
90°
61°
6
89°
60°
7
89°
60°
8
90°
59°
9
89°
60°
10
89°
58°
11
87°
53°
12
84°
56°
13
88°
58°
14
90°
55°
15
87°
51°
16
76°
48°
17
73°
49°
18
81°
50°
19
77°
53°
20
78°
55°
21
86°
55°
22
87°
54°
23
86°
56°
24
85°
54°
25
85°
46°
26
84°
38°
27
71°
42°
28
68°
46°
29
77°
52°
30
79°
36°
1
80°
34°
2
65°
35°
3
62°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Thunder Butte
Thunder Butte's September 2026 forecast shows daily high temperatures ranging from 62° to 90°, with overnight lows between 34° and 61°. The average high for September is 82° with an average low of 52°. 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 Thunder Butte. See also: October | November | December.
