S
M
T
W
T
F
S
30
79°
39°
31
88°
45°
1
73°
45°
2
55°
41°
3
56°
38°
4
56°
35°
5
60°
37°
6
67°
41°
7
64°
38°
8
70°
37°
9
71°
39°
10
71°
39°
11
77°
40°
12
75°
38°
13
71°
37°
14
79°
29°
15
80°
40°
16
72°
37°
17
68°
31°
18
69°
32°
19
71°
36°
20
68°
39°
21
67°
31°
22
68°
34°
23
70°
34°
24
63°
31°
25
62°
32°
26
64°
33°
27
66°
37°
28
63°
36°
29
65°
33°
30
67°
36°
1
65°
34°
2
62°
28°
3
63°
33°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sunriver
Sunriver's September 2026 forecast shows daily high temperatures ranging from 55° to 80°, with overnight lows between 28° and 45°. The average high for September is 67° with an average low of 36°. 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 Sunriver. See also: October | November | December.
