S
M
T
W
T
F
S
26
73°
62°
27
76°
63°
28
79°
53°
29
80°
56°
30
77°
55°
31
74°
54°
1
74°
53°
2
75°
53°
3
74°
52°
4
73°
54°
5
73°
54°
6
72°
50°
7
71°
49°
8
72°
49°
9
72°
50°
10
74°
54°
11
75°
55°
12
73°
54°
13
74°
55°
14
73°
54°
15
71°
52°
16
70°
49°
17
70°
49°
18
71°
52°
19
70°
48°
20
70°
48°
21
71°
49°
22
70°
47°
23
69°
52°
24
68°
48°
25
67°
46°
26
69°
48°
27
70°
51°
28
70°
50°
29
74°
50°
30
76°
51°
31
74°
50°
1
71°
52°
2
72°
45°
3
70°
47°
4
73°
48°
5
75°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Portland
Portland's August 2026 forecast shows daily high temperatures ranging from 67° to 80°, with overnight lows between 45° and 63°. The average high for August is 73° with an average low of 51°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Portland. See also: September | October | November.
