S
M
T
W
T
F
S
30
64°
40°
31
67°
42°
1
63°
46°
2
57°
45°
3
58°
47°
4
61°
49°
5
60°
52°
6
59°
50°
7
59°
42°
8
57°
34°
9
56°
46°
10
60°
37°
11
66°
37°
12
70°
48°
13
67°
55°
14
60°
51°
15
56°
44°
16
57°
43°
17
60°
43°
18
71°
39°
19
76°
51°
20
72°
54°
21
57°
40°
22
N/A
23
62°
54°
24
71°
59°
25
65°
53°
26
56°
50°
27
57°
53°
28
65°
51°
29
59°
49°
30
59°
50°
1
61°
49°
2
61°
53°
3
64°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Portland
Portland's September 2026 forecast shows daily high temperatures ranging from 56° to 71°, with overnight lows between 49° and 59°. The average high for September is 62° 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 Portland. See also: October | November | December.
