S
M
T
W
T
F
S
26
81°
62°
27
81°
62°
28
80°
61°
29
82°
63°
30
81°
62°
31
74°
59°
1
73°
56°
2
76°
58°
3
81°
62°
4
81°
62°
5
82°
63°
6
81°
63°
7
76°
56°
8
82°
59°
9
81°
56°
10
78°
61°
11
81°
63°
12
82°
62°
13
77°
62°
14
77°
56°
15
76°
54°
16
77°
54°
17
73°
60°
18
73°
55°
19
74°
52°
20
72°
54°
21
71°
55°
22
72°
57°
23
79°
58°
24
78°
58°
25
71°
52°
26
71°
56°
27
74°
61°
28
80°
53°
29
80°
54°
30
79°
60°
31
80°
63°
1
81°
62°
2
80°
62°
3
80°
54°
4
78°
58°
5
78°
62°
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 82°, with overnight lows between 52° and 63°. The average high for August is 78° 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.
