S
M
T
W
T
F
S
26
76°
65°
27
78°
65°
28
76°
64°
29
76°
65°
30
78°
65°
31
80°
64°
1
76°
64°
2
75°
63°
3
74°
64°
4
75°
63°
5
75°
64°
6
76°
65°
7
76°
64°
8
77°
63°
9
75°
64°
10
75°
64°
11
74°
63°
12
74°
60°
13
75°
61°
14
75°
63°
15
74°
63°
16
74°
62°
17
75°
63°
18
75°
63°
19
76°
62°
20
75°
62°
21
78°
58°
22
79°
57°
23
78°
54°
24
75°
56°
25
74°
61°
26
75°
55°
27
76°
54°
28
74°
56°
29
73°
60°
30
80°
54°
31
77°
53°
1
74°
55°
2
74°
60°
3
75°
54°
4
75°
59°
5
72°
59°
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 80°, with overnight lows between 53° and 65°. The average high for August is 76° with an average low of 61°. 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.
