S
M
T
W
T
F
S
30
79°
39°
31
88°
45°
1
77°
55°
2
61°
50°
3
63°
43°
4
61°
41°
5
70°
52°
6
59°
45°
7
72°
45°
8
81°
43°
9
90°
48°
10
86°
50°
11
77°
50°
12
73°
45°
13
63°
43°
14
72°
39°
15
70°
48°
16
67°
46°
17
67°
46°
18
75°
40°
19
79°
45°
20
81°
41°
21
74°
36°
22
68°
32°
23
69°
36°
24
71°
37°
25
71°
37°
26
72°
36°
27
70°
38°
28
71°
32°
29
63°
28°
30
63°
32°
1
64°
29°
2
64°
29°
3
61°
27°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sisters
Sisters's September 2026 forecast shows daily high temperatures ranging from 61° to 81°, with overnight lows between 27° and 48°. The average high for September is 69° with an average low of 37°. 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 Sisters. See also: October | November | December.
