S
M
T
W
T
F
S
26
71°
57°
27
74°
58°
28
77°
58°
29
77°
57°
30
79°
56°
31
77°
58°
1
78°
58°
2
77°
59°
3
79°
60°
4
78°
59°
5
83°
64°
6
83°
63°
7
81°
63°
8
79°
62°
9
76°
63°
10
76°
62°
11
81°
62°
12
81°
63°
13
82°
64°
14
82°
63°
15
81°
63°
16
81°
62°
17
79°
58°
18
73°
56°
19
77°
58°
20
78°
59°
21
77°
59°
22
72°
60°
23
73°
57°
24
80°
62°
25
80°
62°
26
79°
61°
27
79°
61°
28
78°
60°
29
79°
61°
30
79°
61°
31
78°
60°
1
80°
62°
2
79°
62°
3
80°
60°
4
79°
60°
5
79°
55°
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 71° to 83°, with overnight lows between 55° and 64°. The average high for August is 78° with an average low of 60°. 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.
