S
M
T
W
T
F
S
30
71°
48°
31
80°
42°
1
78°
45°
2
83°
51°
3
78°
48°
4
85°
46°
5
78°
46°
6
81°
57°
7
71°
51°
8
71°
44°
9
81°
54°
10
85°
51°
11
73°
46°
12
65°
45°
13
68°
46°
14
75°
48°
15
72°
47°
16
76°
46°
17
74°
46°
18
72°
47°
19
71°
41°
20
63°
44°
21
75°
47°
22
65°
45°
23
61°
41°
24
68°
44°
25
73°
46°
26
73°
46°
27
69°
44°
28
60°
34°
29
57°
32°
30
57°
31°
1
58°
35°
2
57°
34°
3
63°
39°
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 57° to 85°, with overnight lows between 31° and 57°. The average high for September is 69° with an average low of 44°. 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.
