S
M
T
W
T
F
S
26
91°
64°
27
85°
59°
28
87°
59°
29
90°
60°
30
89°
57°
31
85°
57°
1
85°
59°
2
90°
60°
3
90°
61°
4
93°
58°
5
94°
62°
6
93°
63°
7
95°
61°
8
94°
59°
9
92°
60°
10
92°
57°
11
91°
55°
12
84°
54°
13
81°
54°
14
84°
55°
15
84°
53°
16
85°
54°
17
81°
54°
18
83°
53°
19
81°
55°
20
84°
55°
21
88°
56°
22
86°
54°
23
84°
54°
24
84°
53°
25
85°
53°
26
83°
52°
27
82°
51°
28
83°
52°
29
84°
52°
30
82°
53°
31
85°
56°
1
87°
55°
2
87°
53°
3
81°
52°
4
80°
49°
5
79°
50°
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 79° to 95°, with overnight lows between 49° and 64°. The average high for August is 86° 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 Sunnyvale. See also: September | October | November.
