S
M
T
W
T
F
S
29
64°
39°
30
57°
39°
1
57°
37°
2
58°
38°
3
59°
39°
4
58°
41°
5
57°
41°
6
59°
40°
7
60°
46°
8
59°
45°
9
58°
47°
10
59°
48°
11
62°
47°
12
62°
44°
13
60°
44°
14
61°
45°
15
60°
45°
16
63°
44°
17
61°
42°
18
57°
44°
19
54°
44°
20
53°
45°
21
60°
41°
22
60°
45°
23
56°
47°
24
60°
45°
25
61°
44°
26
57°
46°
27
57°
42°
28
58°
41°
29
56°
38°
30
55°
45°
31
Hist. Avg.
61°
45°
1
Hist. Avg.
62°
45°
2
Hist. Avg.
62°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in San Ramon
San Ramon's December 2026 forecast shows daily high temperatures ranging from 53° to 64°, with overnight lows between 37° and 48°. The average high for December is 59° with an average low of 43°. 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 San Ramon. See also: January | February | March.
