S
M
T
W
T
F
S
26
71°
55°
27
73°
54°
28
74°
54°
29
77°
55°
30
76°
55°
31
76°
57°
1
76°
55°
2
74°
54°
3
77°
54°
4
80°
56°
5
78°
54°
6
74°
54°
7
75°
55°
8
75°
54°
9
78°
56°
10
74°
53°
11
74°
53°
12
78°
55°
13
77°
53°
14
74°
54°
15
80°
55°
16
81°
62°
17
78°
54°
18
73°
55°
19
72°
60°
20
70°
54°
21
71°
59°
22
77°
62°
23
81°
60°
24
82°
61°
25
80°
60°
26
73°
59°
27
71°
54°
28
79°
53°
29
Hist. Avg.
76°
56°
30
Hist. Avg.
76°
56°
31
Hist. Avg.
76°
56°
1
Hist. Avg.
75°
56°
2
Hist. Avg.
75°
56°
3
Hist. Avg.
75°
56°
4
Hist. Avg.
75°
56°
5
Hist. Avg.
75°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Seattle
Seattle's August 2026 forecast shows daily high temperatures ranging from 70° to 82°, with overnight lows between 53° and 62°. The average high for August is 76° with an average low of 56°. 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.
