S
M
T
W
T
F
S
30
91°
71°
31
86°
76°
1
97°
76°
2
82°
72°
3
91°
74°
4
90°
72°
5
84°
72°
6
84°
68°
7
84°
64°
8
87°
64°
9
93°
69°
10
91°
76°
11
82°
70°
12
83°
68°
13
89°
73°
14
81°
65°
15
79°
59°
16
86°
64°
17
86°
69°
18
86°
72°
19
82°
66°
20
83°
71°
21
73°
63°
22
63°
59°
23
67°
47°
24
65°
50°
25
72°
54°
26
71°
56°
27
70°
55°
28
68°
55°
29
74°
54°
30
75°
59°
1
76°
62°
2
74°
55°
3
73°
55°
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 65° to 76°, with overnight lows between 47° and 62°. The average high for September is 71° with an average low of 55°. 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.
