S
M
T
W
T
F
S
26
79°
61°
27
77°
60°
28
78°
60°
29
76°
56°
30
75°
56°
31
78°
61°
1
80°
64°
2
77°
64°
3
83°
63°
4
83°
62°
5
77°
57°
6
77°
63°
7
83°
63°
8
79°
62°
9
82°
63°
10
77°
59°
11
79°
60°
12
82°
63°
13
81°
60°
14
75°
55°
15
74°
55°
16
75°
57°
17
77°
59°
18
81°
62°
19
78°
61°
20
81°
62°
21
81°
60°
22
74°
56°
23
79°
57°
24
74°
59°
25
79°
60°
26
81°
55°
27
77°
51°
28
73°
50°
29
70°
51°
30
72°
51°
31
73°
58°
1
74°
59°
2
78°
60°
3
74°
51°
4
74°
49°
5
71°
50°
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 83°, with overnight lows between 49° and 64°. The average high for August is 77° with an average low of 58°. 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.
