S
M
T
W
T
F
S
30
93°
80°
1
89°
79°
2
89°
79°
3
91°
80°
4
90°
78°
5
88°
78°
6
87°
77°
7
83°
79°
8
88°
77°
9
84°
77°
10
89°
77°
11
89°
78°
12
89°
77°
13
89°
77°
14
88°
77°
15
84°
76°
16
90°
76°
17
90°
76°
18
89°
78°
19
88°
78°
20
87°
76°
21
88°
76°
22
85°
78°
23
89°
76°
24
88°
76°
25
89°
77°
26
89°
77°
27
89°
76°
28
87°
76°
29
88°
78°
30
90°
78°
31
89°
77°
1
89°
77°
2
83°
76°
3
87°
75°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in San Jose
San Jose'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 Jose. See also: January | February | March.
