S
M
T
W
T
F
S
30
80°
68°
31
89°
71°
1
95°
74°
2
94°
72°
3
93°
74°
4
95°
73°
5
85°
70°
6
82°
56°
7
80°
59°
8
84°
68°
9
79°
57°
10
78°
52°
11
80°
58°
12
81°
60°
13
77°
57°
14
73°
54°
15
73°
54°
16
77°
56°
17
75°
51°
18
74°
52°
19
74°
50°
20
76°
56°
21
73°
55°
22
71°
54°
23
72°
54°
24
76°
53°
25
77°
54°
26
76°
54°
27
76°
55°
28
77°
55°
29
77°
54°
30
75°
54°
1
73°
48°
2
65°
44°
3
62°
39°
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 62° to 84°, with overnight lows between 39° and 68°. The average high for September is 75° with an average low of 54°. 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.
