S
M
T
W
T
F
S
26
74°
59°
27
79°
59°
28
73°
58°
29
75°
56°
30
79°
54°
31
84°
56°
1
72°
58°
2
71°
56°
3
76°
53°
4
81°
58°
5
87°
59°
6
88°
59°
7
86°
59°
8
80°
57°
9
75°
57°
10
76°
58°
11
77°
59°
12
75°
61°
13
80°
62°
14
85°
61°
15
84°
59°
16
78°
58°
17
78°
59°
18
80°
60°
19
78°
59°
20
77°
57°
21
76°
58°
22
72°
57°
23
75°
61°
24
80°
62°
25
81°
62°
26
80°
61°
27
79°
62°
28
78°
59°
29
77°
60°
30
73°
59°
31
75°
60°
1
74°
61°
2
71°
59°
3
75°
60°
4
79°
60°
5
80°
61°
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 85°, with overnight lows between 57° and 62°. 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.
