S
M
T
W
T
F
S
30
81°
45°
31
80°
44°
1
74°
51°
2
82°
47°
3
81°
49°
4
74°
50°
5
81°
48°
6
79°
45°
7
80°
45°
8
73°
40°
9
70°
39°
10
68°
39°
11
67°
40°
12
68°
44°
13
69°
39°
14
68°
38°
15
67°
39°
16
67°
37°
17
66°
36°
18
64°
35°
19
64°
36°
20
65°
36°
21
69°
41°
22
72°
39°
23
70°
46°
24
73°
42°
25
67°
35°
26
65°
41°
27
65°
34°
28
63°
33°
29
61°
33°
30
62°
41°
1
61°
44°
2
66°
33°
3
72°
31°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Big Timber
Big Timber's September 2026 forecast shows daily high temperatures ranging from 61° to 82°, with overnight lows between 31° and 51°. The average high for September is 70° with an average low of 40°. 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 Big Timber. See also: October | November | December.
