S
M
T
W
T
F
S
26
80°
61°
27
81°
61°
28
82°
62°
29
81°
60°
30
80°
61°
31
73°
57°
1
73°
55°
2
81°
62°
3
82°
62°
4
80°
61°
5
74°
59°
6
75°
58°
7
80°
62°
8
81°
61°
9
81°
63°
10
80°
62°
11
77°
60°
12
74°
58°
13
80°
61°
14
76°
61°
15
73°
60°
16
75°
59°
17
74°
59°
18
72°
57°
19
78°
61°
20
79°
62°
21
77°
63°
22
80°
60°
23
82°
61°
24
79°
60°
25
80°
61°
26
71°
53°
27
71°
53°
28
78°
58°
29
79°
60°
30
71°
52°
31
70°
58°
1
72°
55°
2
69°
54°
3
71°
53°
4
76°
58°
5
69°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Seattle
Seattle's August 2026 forecast shows daily high temperatures ranging from 69° to 82°, with overnight lows between 51° and 63°. The average high for August is 77° with an average low of 59°. 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 Seattle. See also: September | October | November.
