S
M
T
W
T
F
S
26
80°
62°
27
80°
62°
28
79°
61°
29
79°
59°
30
77°
59°
31
75°
58°
1
74°
57°
2
73°
57°
3
74°
59°
4
77°
62°
5
79°
62°
6
79°
61°
7
80°
61°
8
79°
60°
9
76°
61°
10
79°
61°
11
80°
59°
12
81°
60°
13
81°
62°
14
80°
61°
15
80°
60°
16
79°
62°
17
78°
64°
18
79°
63°
19
80°
62°
20
80°
60°
21
79°
58°
22
77°
57°
23
77°
56°
24
78°
56°
25
79°
56°
26
79°
58°
27
78°
57°
28
78°
56°
29
75°
55°
30
76°
57°
31
75°
59°
1
78°
58°
2
81°
59°
3
77°
57°
4
75°
57°
5
82°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Sunnyvale
Sunnyvale's August 2026 forecast shows daily high temperatures ranging from 73° to 82°, with overnight lows between 55° and 64°. 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 Sunnyvale. See also: September | October | November.
