S
M
T
W
T
F
S
26
77°
59°
27
77°
60°
28
78°
58°
29
76°
58°
30
79°
57°
31
77°
58°
1
78°
59°
2
78°
60°
3
84°
61°
4
84°
62°
5
83°
61°
6
84°
62°
7
84°
62°
8
83°
60°
9
83°
59°
10
82°
58°
11
82°
59°
12
83°
61°
13
83°
61°
14
82°
60°
15
81°
61°
16
80°
61°
17
80°
59°
18
79°
58°
19
78°
59°
20
78°
61°
21
79°
58°
22
79°
57°
23
81°
58°
24
82°
58°
25
81°
61°
26
82°
60°
27
82°
60°
28
81°
59°
29
80°
59°
30
80°
58°
31
79°
57°
1
80°
58°
2
81°
58°
3
82°
57°
4
82°
59°
5
81°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Cupertino
Cupertino's August 2026 forecast shows daily high temperatures ranging from 76° to 84°, with overnight lows between 57° and 62°. The average high for August is 81° 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 Cupertino. See also: September | October | November.
