S
M
T
W
T
F
S
26
83°
62°
27
84°
62°
28
84°
61°
29
82°
61°
30
77°
60°
31
76°
58°
1
77°
58°
2
79°
60°
3
81°
60°
4
82°
61°
5
84°
62°
6
85°
63°
7
86°
62°
8
84°
61°
9
84°
62°
10
86°
62°
11
86°
63°
12
85°
62°
13
83°
62°
14
75°
55°
15
76°
49°
16
76°
52°
17
80°
51°
18
79°
49°
19
75°
46°
20
74°
49°
21
74°
52°
22
75°
48°
23
74°
53°
24
81°
56°
25
74°
53°
26
82°
55°
27
82°
47°
28
76°
45°
29
70°
46°
30
72°
49°
31
71°
50°
1
71°
49°
2
72°
50°
3
77°
44°
4
73°
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 86°, with overnight lows between 44° and 63°. The average high for August is 79° with an average low of 55°. 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.
