S
M
T
W
T
F
S
29
64°
35°
30
57°
35°
1
57°
32°
2
58°
33°
3
59°
34°
4
57°
37°
5
57°
37°
6
59°
36°
7
59°
41°
8
60°
42°
9
58°
43°
10
59°
43°
11
61°
42°
12
62°
40°
13
61°
39°
14
60°
40°
15
61°
41°
16
62°
41°
17
61°
37°
18
57°
40°
19
54°
40°
20
53°
39°
21
59°
36°
22
60°
40°
23
55°
42°
24
59°
41°
25
60°
39°
26
57°
42°
27
58°
38°
28
57°
37°
29
55°
34°
30
54°
41°
31
55°
41°
1
Hist. Avg.
56°
39°
2
Hist. Avg.
56°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Vacaville
Vacaville's December 2026 forecast shows daily high temperatures ranging from 53° to 64°, with overnight lows between 32° and 43°. The average high for December is 58° with an average low of 39°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Vacaville. See also: January | February | March.
