S
M
T
W
T
F
S
30
67°
40°
31
76°
32°
1
79°
46°
2
75°
45°
3
70°
41°
4
69°
45°
5
73°
45°
6
73°
43°
7
59°
40°
8
62°
32°
9
72°
31°
10
79°
37°
11
65°
43°
12
72°
41°
13
69°
44°
14
57°
34°
15
69°
27°
16
66°
37°
17
74°
41°
18
65°
45°
19
61°
37°
20
68°
36°
21
70°
37°
22
68°
35°
23
69°
40°
24
76°
39°
25
66°
38°
26
63°
35°
27
61°
36°
28
59°
34°
29
61°
31°
30
53°
27°
1
52°
25°
2
63°
35°
3
57°
28°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Butte
Butte's September 2026 forecast shows daily high temperatures ranging from 52° to 76°, with overnight lows between 25° and 45°. The average high for September is 64° with an average low of 35°. 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 Butte. See also: October | November | December.
