S
M
T
W
T
F
S
30
69°
33°
31
72°
37°
1
73°
35°
2
73°
46°
3
73°
51°
4
69°
36°
5
82°
40°
6
82°
42°
7
66°
35°
8
67°
41°
9
67°
32°
10
67°
43°
11
68°
38°
12
70°
35°
13
72°
36°
14
75°
40°
15
76°
43°
16
73°
34°
17
65°
30°
18
73°
31°
19
75°
32°
20
78°
34°
21
83°
36°
22
85°
54°
23
77°
56°
24
N/A
25
76°
50°
26
74°
52°
27
57°
43°
28
53°
39°
29
64°
39°
30
69°
43°
1
76°
46°
2
76°
45°
3
67°
42°
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 53° to 76°, with overnight lows between 39° and 52°. The average high for September is 68° with an average low of 44°. 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.
