S
M
T
W
T
F
S
26
84°
66°
27
85°
69°
28
83°
68°
29
81°
63°
30
84°
59°
31
85°
63°
1
N/A
2
73°
59°
3
79°
55°
4
81°
59°
5
84°
63°
6
82°
63°
7
80°
65°
8
83°
64°
9
85°
63°
10
84°
60°
11
80°
60°
12
79°
61°
13
78°
61°
14
80°
60°
15
76°
56°
16
76°
57°
17
85°
65°
18
84°
65°
19
86°
64°
20
85°
63°
21
83°
63°
22
84°
62°
23
85°
64°
24
85°
64°
25
83°
63°
26
81°
63°
27
80°
62°
28
79°
61°
29
81°
62°
30
80°
61°
31
81°
61°
1
83°
60°
2
79°
57°
3
77°
57°
4
78°
58°
5
82°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Portland
Portland's August 2026 forecast shows daily high temperatures ranging from 73° to 86°, with overnight lows between 55° and 65°. The average high for August is 81° 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.
