S
M
T
W
T
F
S
30
80°
58°
31
78°
58°
1
76°
63°
2
76°
64°
3
84°
63°
4
84°
64°
5
83°
61°
6
79°
57°
7
79°
62°
8
80°
55°
9
75°
54°
10
75°
54°
11
74°
55°
12
77°
54°
13
76°
60°
14
80°
55°
15
73°
53°
16
72°
55°
17
73°
53°
18
74°
58°
19
77°
51°
20
76°
53°
21
75°
54°
22
79°
50°
23
73°
50°
24
72°
51°
25
72°
51°
26
73°
56°
27
76°
56°
28
77°
57°
29
78°
48°
30
72°
50°
1
69°
56°
2
76°
55°
3
77°
49°
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 69° to 84°, with overnight lows between 48° and 64°. The average high for September is 76° with an average low of 56°. 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.
