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
83°
58°
9
77°
55°
10
78°
56°
11
79°
59°
12
76°
57°
13
83°
60°
14
86°
59°
15
81°
56°
16
78°
57°
17
76°
56°
18
77°
57°
19
78°
56°
20
76°
56°
21
78°
57°
22
80°
58°
23
76°
54°
24
81°
59°
25
81°
59°
26
80°
58°
27
79°
58°
28
78°
56°
29
77°
57°
30
73°
56°
31
75°
57°
1
75°
58°
2
71°
56°
3
75°
57°
4
79°
57°
5
80°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Issaquah Plateau
Issaquah Plateau's August 2026 forecast shows daily high temperatures ranging from 71° to 86°, with overnight lows between 54° and 60°. The average high for August is 78° with an average low of 57°. 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 Issaquah Plateau. See also: September | October | November.
