S
M
T
W
T
F
S
26
74°
49°
27
80°
49°
28
75°
57°
29
71°
62°
30
78°
63°
31
80°
64°
1
80°
65°
2
78°
68°
3
72°
65°
4
83°
60°
5
79°
67°
6
82°
69°
7
86°
67°
8
84°
68°
9
83°
67°
10
80°
64°
11
80°
61°
12
78°
62°
13
74°
61°
14
76°
60°
15
75°
61°
16
75°
59°
17
75°
63°
18
75°
63°
19
76°
60°
20
76°
60°
21
74°
58°
22
74°
63°
23
80°
64°
24
79°
63°
25
73°
62°
26
77°
59°
27
73°
58°
28
72°
62°
29
73°
62°
30
79°
62°
31
78°
60°
1
77°
57°
2
70°
58°
3
70°
57°
4
71°
54°
5
71°
56°
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 70° to 86°, with overnight lows between 54° and 69°. The average high for August is 77° with an average low of 62°. 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.
