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
77°
59°
2
82°
59°
3
82°
61°
4
77°
61°
5
75°
61°
6
75°
63°
7
72°
61°
8
86°
61°
9
89°
60°
10
83°
58°
11
85°
59°
12
82°
61°
13
79°
62°
14
81°
61°
15
80°
60°
16
80°
60°
17
81°
61°
18
79°
62°
19
82°
60°
20
80°
61°
21
80°
60°
22
79°
58°
23
78°
61°
24
76°
58°
25
78°
59°
26
80°
60°
27
81°
61°
28
81°
62°
29
78°
61°
30
81°
61°
31
81°
60°
1
83°
61°
2
82°
61°
3
77°
60°
4
77°
61°
5
79°
60°
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 89°, with overnight lows between 58° and 62°. The average high for August is 81° 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 Cupertino. See also: September | October | November.
