S
M
T
W
T
F
S
31
58°
47°
1
59°
44°
2
58°
43°
3
58°
47°
4
54°
37°
5
58°
33°
6
65°
42°
7
70°
56°
8
61°
52°
9
58°
39°
10
56°
36°
11
57°
43°
12
60°
42°
13
61°
46°
14
71°
43°
15
76°
55°
16
60°
49°
17
57°
43°
18
67°
41°
19
63°
45°
20
56°
43°
21
58°
50°
22
58°
47°
23
59°
47°
24
58°
52°
25
57°
52°
26
60°
51°
27
58°
48°
28
61°
45°
29
63°
46°
30
61°
47°
1
59°
46°
2
56°
44°
3
60°
52°
4
74°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Portland
Portland's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
