S
M
T
W
T
F
S
30
72°
46°
31
69°
46°
1
73°
45°
2
66°
41°
3
66°
39°
4
69°
44°
5
75°
44°
6
64°
34°
7
61°
32°
8
63°
33°
9
64°
35°
10
72°
41°
11
72°
42°
12
71°
37°
13
61°
36°
14
69°
38°
15
62°
37°
16
62°
36°
17
65°
39°
18
69°
40°
19
70°
39°
20
67°
35°
21
68°
36°
22
68°
39°
23
73°
41°
24
73°
40°
25
70°
38°
26
61°
39°
27
66°
41°
28
70°
35°
29
61°
28°
30
56°
37°
1
59°
33°
2
54°
24°
3
54°
31°
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 54° to 75°, with overnight lows between 24° and 46°. The average high for September is 66° with an average low of 38°. 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.
