S
M
T
W
T
F
S
30
78°
36°
31
78°
37°
1
77°
40°
2
75°
45°
3
76°
43°
4
73°
39°
5
74°
37°
6
73°
39°
7
75°
38°
8
74°
36°
9
76°
38°
10
75°
34°
11
77°
37°
12
72°
36°
13
74°
44°
14
75°
33°
15
70°
32°
16
Hist. Avg.
76°
41°
17
Hist. Avg.
76°
41°
18
Hist. Avg.
75°
41°
19
Hist. Avg.
75°
41°
20
Hist. Avg.
75°
40°
21
Hist. Avg.
74°
40°
22
Hist. Avg.
74°
40°
23
Hist. Avg.
74°
40°
24
Hist. Avg.
73°
39°
25
Hist. Avg.
73°
39°
26
Hist. Avg.
72°
39°
27
Hist. Avg.
72°
38°
28
Hist. Avg.
72°
38°
29
Hist. Avg.
71°
38°
30
Hist. Avg.
71°
38°
1
Hist. Avg.
70°
37°
2
Hist. Avg.
70°
37°
3
Hist. Avg.
69°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Sisters
Sisters's September 2026 forecast shows daily high temperatures ranging from 70° to 78°, with overnight lows between 32° and 45°. The average high for September is 75° 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 Sisters. See also: October | November | December.
