S
M
T
W
T
F
S
26
66°
51°
27
68°
48°
28
76°
42°
29
81°
44°
30
84°
46°
1
82°
52°
2
70°
54°
3
73°
51°
4
67°
53°
5
70°
52°
6
80°
51°
7
87°
52°
8
89°
52°
9
94°
58°
10
96°
61°
11
101°
60°
12
89°
58°
13
88°
55°
14
89°
56°
15
95°
62°
16
83°
55°
17
85°
56°
18
84°
55°
19
85°
56°
20
86°
56°
21
85°
54°
22
84°
54°
23
86°
56°
24
87°
56°
25
87°
55°
26
86°
55°
27
80°
54°
28
79°
54°
29
81°
55°
30
81°
56°
31
82°
57°
1
84°
57°
2
87°
58°
3
86°
57°
4
81°
56°
5
83°
56°
6
81°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Vacaville
Vacaville's May 2026 forecast shows daily high temperatures ranging from 67° to 101°, with overnight lows between 51° and 62°. The average high for May is 84° 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 May weather will actually feel in Vacaville. See also: June | July | August.
