S
M
T
W
T
F
S
30
91°
74°
1
90°
74°
2
84°
71°
3
91°
71°
4
90°
74°
5
93°
73°
6
95°
72°
7
92°
72°
8
83°
71°
9
88°
70°
10
89°
71°
11
86°
73°
12
88°
73°
13
79°
71°
14
90°
75°
15
89°
67°
16
71°
64°
17
84°
66°
18
90°
65°
19
91°
72°
20
90°
73°
21
87°
75°
22
79°
72°
23
82°
72°
24
85°
73°
25
86°
73°
26
87°
72°
27
86°
72°
28
89°
72°
29
84°
73°
30
85°
71°
31
89°
71°
1
87°
73°
2
91°
74°
3
94°
74°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in San Ramon
San Ramon's December 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for December is ° with an average low of °. 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.
