S
M
T
W
T
F
S
26
80°
63°
27
80°
62°
28
81°
62°
29
80°
60°
30
81°
62°
31
82°
63°
1
81°
62°
2
80°
62°
3
81°
60°
4
73°
58°
5
73°
58°
6
74°
56°
7
75°
59°
8
80°
61°
9
80°
61°
10
79°
60°
11
78°
58°
12
75°
56°
13
74°
56°
14
70°
52°
15
71°
55°
16
74°
62°
17
80°
63°
18
82°
62°
19
83°
61°
20
81°
53°
21
77°
61°
22
80°
62°
23
82°
56°
24
71°
53°
25
73°
54°
26
73°
55°
27
75°
52°
28
74°
55°
29
74°
53°
30
69°
53°
31
74°
57°
1
77°
61°
2
80°
61°
3
78°
60°
4
69°
50°
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 83°, with overnight lows between 50° and 63°. The average high for August is 77° with an average low of 58°. 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.
