S
M
T
W
T
F
S
30
78°
67°
31
84°
71°
1
86°
73°
2
94°
72°
3
93°
70°
4
80°
69°
5
76°
65°
6
76°
61°
7
77°
60°
8
84°
70°
9
85°
67°
10
79°
57°
11
78°
59°
12
80°
66°
13
81°
60°
14
76°
58°
15
74°
56°
16
73°
58°
17
76°
58°
18
73°
56°
19
75°
54°
20
79°
60°
21
75°
58°
22
69°
58°
23
70°
57°
24
74°
58°
25
77°
58°
26
77°
57°
27
75°
57°
28
77°
58°
29
78°
59°
30
78°
59°
1
77°
56°
2
74°
51°
3
63°
47°
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 63° to 85°, with overnight lows between 47° and 70°. The average high for September is 76° with an average low of 58°. 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.
