S
M
T
W
T
F
S
26
80°
63°
27
84°
56°
28
82°
59°
29
81°
57°
30
82°
58°
31
90°
57°
1
75°
60°
2
75°
56°
3
81°
53°
4
90°
53°
5
89°
56°
6
94°
56°
7
90°
58°
8
91°
57°
9
84°
57°
10
83°
60°
11
83°
62°
12
80°
58°
13
85°
62°
14
90°
63°
15
86°
62°
16
83°
61°
17
83°
61°
18
85°
61°
19
81°
62°
20
82°
61°
21
80°
58°
22
76°
56°
23
80°
60°
24
83°
62°
25
83°
61°
26
82°
62°
27
80°
61°
28
79°
58°
29
79°
60°
30
76°
59°
31
79°
60°
1
78°
62°
2
74°
57°
3
80°
59°
4
83°
62°
5
83°
61°
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 74° to 91°, with overnight lows between 56° and 63°. The average high for August is 82° with an average low of 60°. 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.
