S
M
T
W
T
F
S
30
75°
50°
31
76°
56°
1
77°
59°
2
84°
58°
3
86°
58°
4
78°
49°
5
73°
49°
6
75°
53°
7
74°
48°
8
73°
49°
9
74°
54°
10
71°
55°
11
72°
52°
12
72°
49°
13
73°
54°
14
73°
56°
15
80°
54°
16
81°
48°
17
77°
50°
18
76°
47°
19
79°
48°
20
79°
55°
21
78°
52°
22
75°
48°
23
71°
51°
24
69°
49°
25
68°
48°
26
71°
47°
27
68°
54°
28
67°
53°
29
66°
50°
30
67°
51°
1
74°
54°
2
72°
52°
3
Hist. Avg.
71°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Oregon City
Oregon City's September 2026 forecast shows daily high temperatures ranging from 66° to 86°, with overnight lows between 47° and 59°. The average high for September is 74° with an average low of 52°. 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 City. See also: October | November | December.
