S
M
T
W
T
F
S
26
73°
56°
27
72°
55°
28
71°
56°
29
75°
56°
30
73°
55°
31
73°
56°
1
74°
55°
2
75°
56°
3
74°
54°
4
68°
53°
5
71°
57°
6
75°
56°
7
73°
56°
8
73°
55°
9
74°
55°
10
69°
54°
11
68°
54°
12
68°
51°
13
67°
50°
14
67°
55°
15
70°
55°
16
71°
53°
17
68°
52°
18
68°
49°
19
70°
48°
20
68°
49°
21
66°
52°
22
70°
51°
23
69°
48°
24
70°
48°
25
68°
47°
26
66°
47°
27
65°
49°
28
66°
47°
29
67°
48°
30
66°
52°
31
71°
47°
1
70°
46°
2
65°
46°
3
63°
47°
4
63°
45°
5
64°
44°
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 63° to 75°, with overnight lows between 44° and 57°. The average high for August is 69° with an average low of 52°. 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.
