S
M
T
W
T
F
S
26
64°
52°
27
64°
52°
28
68°
48°
29
70°
50°
30
66°
52°
1
64°
55°
2
64°
55°
3
66°
54°
4
66°
50°
5
63°
54°
6
70°
55°
7
64°
54°
8
64°
54°
9
68°
54°
10
66°
54°
11
77°
54°
12
66°
57°
13
70°
55°
14
72°
52°
15
75°
52°
16
72°
52°
17
75°
52°
18
81°
61°
19
86°
55°
20
79°
57°
21
77°
55°
22
70°
55°
23
72°
54°
24
74°
53°
25
70°
54°
26
70°
51°
27
76°
51°
28
74°
52°
29
65°
53°
30
67°
52°
31
73°
53°
1
75°
54°
2
74°
56°
3
78°
59°
4
78°
57°
5
77°
58°
6
74°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Sunnyvale
Sunnyvale's May 2026 forecast shows daily high temperatures ranging from 65° to 78°, with overnight lows between 51° and 59°. The average high for May is 73° 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 Sunnyvale. See also: June | July | August.
