S
M
T
W
T
F
S
26
77°
64°
27
79°
65°
28
77°
63°
29
80°
63°
30
81°
66°
31
82°
64°
1
83°
58°
2
80°
58°
3
76°
59°
4
76°
58°
5
75°
57°
6
76°
57°
7
77°
58°
8
78°
62°
9
78°
63°
10
80°
64°
11
79°
64°
12
82°
63°
13
77°
63°
14
80°
62°
15
83°
57°
16
77°
62°
17
78°
56°
18
77°
56°
19
75°
55°
20
74°
56°
21
75°
59°
22
75°
58°
23
74°
56°
24
77°
61°
25
76°
59°
26
81°
62°
27
78°
61°
28
81°
56°
29
76°
58°
30
72°
55°
31
73°
54°
1
73°
53°
2
72°
53°
3
72°
59°
4
73°
56°
5
76°
53°
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 72° to 83°, with overnight lows between 53° and 66°. The average high for August is 77° with an average low of 59°. 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.
