S
M
T
W
T
F
S
29
74°
53°
30
74°
48°
1
72°
39°
2
59°
38°
3
61°
39°
4
65°
48°
5
69°
43°
6
61°
39°
7
59°
39°
8
58°
37°
9
57°
35°
10
59°
36°
11
62°
38°
12
62°
41°
13
66°
46°
14
63°
37°
15
61°
36°
16
60°
43°
17
66°
37°
18
60°
34°
19
57°
32°
20
58°
35°
21
59°
41°
22
64°
35°
23
65°
34°
24
58°
34°
25
62°
35°
26
58°
35°
27
60°
43°
28
61°
35°
29
60°
33°
30
58°
34°
31
59°
31°
1
57°
33°
2
58°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Pleasanton
Pleasanton's December 2026 forecast shows daily high temperatures ranging from 57° to 74°, with overnight lows between 31° and 53°. The average high for December is 62° with an average low of 38°. 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 Pleasanton. See also: January | February | March.
