S
M
T
W
T
F
S
30
75°
51°
31
80°
48°
1
73°
51°
2
81°
52°
3
79°
54°
4
80°
54°
5
80°
55°
6
79°
48°
7
76°
43°
8
68°
45°
9
69°
45°
10
68°
49°
11
69°
53°
12
77°
52°
13
78°
54°
14
79°
53°
15
78°
42°
16
67°
43°
17
71°
39°
18
Hist. Avg.
69°
43°
19
Hist. Avg.
68°
43°
20
Hist. Avg.
68°
42°
21
Hist. Avg.
68°
42°
22
Hist. Avg.
67°
41°
23
Hist. Avg.
67°
41°
24
Hist. Avg.
66°
40°
25
Hist. Avg.
66°
40°
26
Hist. Avg.
65°
40°
27
Hist. Avg.
65°
39°
28
Hist. Avg.
64°
39°
29
Hist. Avg.
64°
38°
30
Hist. Avg.
63°
38°
1
Hist. Avg.
63°
37°
2
Hist. Avg.
62°
37°
3
Hist. Avg.
62°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Butte
Butte's September 2026 forecast shows daily high temperatures ranging from 67° to 81°, with overnight lows between 39° and 55°. The average high for September is 75° with an average low of 49°. 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.
