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
71°
55°
3
70°
54°
4
64°
51°
5
67°
53°
6
78°
57°
7
82°
53°
8
84°
53°
9
89°
54°
10
87°
54°
11
94°
56°
12
88°
56°
13
83°
55°
14
83°
58°
15
85°
56°
16
91°
57°
17
90°
56°
18
89°
57°
19
87°
54°
20
88°
56°
21
87°
58°
22
96°
63°
23
86°
56°
24
85°
55°
25
79°
52°
26
77°
49°
27
78°
50°
28
83°
52°
29
79°
53°
30
79°
52°
31
82°
55°
1
87°
57°
2
88°
57°
3
87°
54°
4
82°
53°
5
88°
58°
6
88°
58°
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 77° to 96°, with overnight lows between 49° and 63°. The average high for May is 86° with an average low of 55°. 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.
