S
M
T
W
T
F
S
26
72°
59°
27
72°
57°
28
75°
59°
29
73°
59°
30
75°
59°
31
77°
57°
1
84°
59°
2
88°
58°
3
88°
60°
4
85°
60°
5
83°
58°
6
79°
60°
7
77°
59°
8
80°
62°
9
79°
61°
10
77°
60°
11
76°
60°
12
77°
59°
13
75°
61°
14
76°
59°
15
74°
60°
16
73°
60°
17
74°
59°
18
75°
59°
19
74°
58°
20
74°
58°
21
77°
60°
22
76°
59°
23
74°
62°
24
78°
61°
25
79°
61°
26
78°
62°
27
79°
62°
28
80°
61°
29
78°
62°
30
77°
61°
31
79°
61°
1
77°
59°
2
77°
60°
3
80°
59°
4
76°
61°
5
75°
61°
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 88°, with overnight lows between 58° 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 Sunnyvale. See also: September | October | November.
