S
M
T
W
T
F
S
26
84°
68°
27
87°
65°
28
83°
71°
29
80°
62°
30
83°
57°
31
87°
61°
1
80°
70°
2
82°
68°
3
82°
62°
4
83°
69°
5
85°
68°
6
88°
66°
7
86°
66°
8
89°
67°
9
88°
68°
10
89°
65°
11
86°
65°
12
85°
63°
13
87°
61°
14
86°
59°
15
81°
58°
16
80°
57°
17
89°
65°
18
89°
65°
19
88°
64°
20
89°
64°
21
87°
63°
22
88°
64°
23
89°
65°
24
89°
64°
25
87°
64°
26
86°
63°
27
86°
64°
28
84°
62°
29
83°
63°
30
85°
62°
31
86°
62°
1
87°
61°
2
84°
57°
3
81°
57°
4
83°
58°
5
84°
57°
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 80° to 89°, with overnight lows between 57° and 70°. The average high for August is 86° with an average low of 63°. 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.
