S
M
T
W
T
F
S
30
79°
47°
31
69°
47°
1
70°
53°
2
74°
54°
3
68°
47°
4
68°
55°
5
70°
49°
6
72°
47°
7
70°
46°
8
68°
45°
9
67°
45°
10
67°
49°
11
68°
44°
12
67°
45°
13
66°
44°
14
69°
51°
15
71°
43°
16
65°
41°
17
64°
41°
18
62°
40°
19
62°
42°
20
63°
42°
21
63°
43°
22
62°
41°
23
63°
47°
24
68°
47°
25
68°
46°
26
67°
48°
27
69°
40°
28
65°
37°
29
59°
38°
30
59°
46°
1
60°
47°
2
63°
46°
3
66°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Oregon
Oregon's September 2026 forecast shows daily high temperatures ranging from 59° to 79°, with overnight lows between 37° and 55°. The average high for September is 67° with an average low of 45°. 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 Oregon. See also: October | November | December.
