S
M
T
W
T
F
S
26
78°
64°
27
79°
65°
28
82°
65°
29
82°
64°
30
81°
65°
31
78°
64°
1
76°
66°
2
81°
65°
3
79°
65°
4
76°
64°
5
78°
63°
6
77°
61°
7
76°
64°
8
81°
59°
9
75°
57°
10
75°
57°
11
76°
63°
12
75°
59°
13
74°
62°
14
75°
64°
15
78°
63°
16
80°
64°
17
78°
58°
18
75°
56°
19
76°
59°
20
77°
62°
21
75°
60°
22
76°
56°
23
79°
55°
24
75°
55°
25
74°
54°
26
74°
54°
27
73°
55°
28
73°
55°
29
76°
58°
30
76°
60°
31
79°
60°
1
80°
61°
2
80°
60°
3
78°
53°
4
76°
51°
5
70°
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 82°, with overnight lows between 51° and 66°. The average high for August is 77° 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.
