S
M
T
W
T
F
S
26
57°
44°
27
60°
47°
28
56°
44°
29
54°
45°
30
53°
41°
31
N/A
1
59°
47°
2
61°
50°
3
57°
50°
4
57°
47°
5
57°
48°
6
60°
47°
7
56°
47°
8
58°
46°
9
59°
48°
10
56°
50°
11
61°
51°
12
65°
53°
13
57°
50°
14
60°
50°
15
58°
49°
16
57°
50°
17
56°
51°
18
59°
51°
19
59°
50°
20
60°
51°
21
59°
51°
22
61°
50°
23
61°
52°
24
60°
51°
25
61°
52°
26
60°
51°
27
61°
52°
28
61°
51°
29
62°
52°
30
62°
51°
31
56°
51°
1
57°
49°
2
56°
45°
3
57°
48°
4
61°
52°
5
62°
51°
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 56° to 65°, with overnight lows between 45° and 53°. The average high for August is 59° with an average low of 50°. 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.
