S
M
T
W
T
F
S
26
64°
52°
27
64°
52°
28
68°
48°
29
70°
50°
30
66°
52°
1
71°
52°
2
69°
51°
3
68°
52°
4
66°
53°
5
66°
52°
6
73°
55°
7
72°
54°
8
71°
55°
9
78°
56°
10
79°
57°
11
77°
55°
12
79°
56°
13
79°
57°
14
72°
52°
15
68°
53°
16
68°
52°
17
69°
50°
18
68°
53°
19
68°
49°
20
69°
52°
21
71°
54°
22
75°
54°
23
77°
57°
24
78°
57°
25
77°
56°
26
75°
55°
27
72°
55°
28
70°
54°
29
70°
53°
30
71°
54°
31
70°
54°
1
70°
53°
2
71°
53°
3
73°
54°
4
76°
56°
5
74°
54°
6
72°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Cupertino
Cupertino's May 2026 forecast shows daily high temperatures ranging from 66° to 79°, with overnight lows between 49° and 57°. The average high for May is 72° with an average low of 54°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Cupertino. See also: June | July | August.
