S
M
T
W
T
F
S
26
86°
66°
27
86°
67°
28
87°
68°
29
87°
68°
30
86°
67°
31
86°
68°
1
85°
67°
2
84°
68°
3
86°
68°
4
85°
67°
5
84°
64°
6
83°
65°
7
85°
67°
8
86°
61°
9
79°
60°
10
78°
60°
11
79°
64°
12
79°
63°
13
80°
66°
14
78°
67°
15
80°
67°
16
84°
66°
17
80°
58°
18
79°
58°
19
79°
64°
20
80°
62°
21
79°
63°
22
83°
62°
23
83°
62°
24
81°
58°
25
76°
57°
26
77°
58°
27
76°
57°
28
75°
56°
29
77°
57°
30
77°
61°
31
82°
63°
1
82°
63°
2
81°
62°
3
82°
56°
4
81°
54°
5
74°
55°
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 87°, with overnight lows between 54° and 68°. The average high for August is 81° 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.
