S
M
T
W
T
F
S
30
80°
51°
31
82°
50°
1
76°
44°
2
76°
43°
3
77°
50°
4
81°
49°
5
77°
49°
6
74°
39°
7
75°
46°
8
80°
49°
9
84°
49°
10
86°
50°
11
85°
50°
12
85°
49°
13
84°
49°
14
78°
44°
15
74°
44°
16
75°
47°
17
82°
46°
18
84°
48°
19
85°
45°
20
83°
44°
21
80°
47°
22
82°
48°
23
83°
45°
24
80°
46°
25
80°
48°
26
81°
48°
27
82°
44°
28
78°
42°
29
69°
43°
30
71°
42°
1
72°
37°
2
66°
34°
3
65°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Prineville
Prineville's September 2026 forecast shows daily high temperatures ranging from 65° to 86°, with overnight lows between 34° and 51°. The average high for September is 79° with an average low of 46°. 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 Prineville. See also: October | November | December.
