S
M
T
W
T
F
S
29
69°
56°
30
64°
55°
1
65°
54°
2
64°
55°
3
63°
54°
4
64°
54°
5
64°
53°
6
68°
54°
7
69°
54°
8
67°
53°
9
62°
54°
10
63°
54°
11
61°
45°
12
60°
46°
13
61°
49°
14
65°
48°
15
68°
51°
16
67°
49°
17
62°
53°
18
65°
52°
19
65°
55°
20
66°
55°
21
68°
46°
22
66°
45°
23
62°
44°
24
60°
46°
25
61°
49°
26
63°
49°
27
66°
48°
28
62°
48°
29
62°
47°
30
61°
46°
31
60°
45°
1
61°
46°
2
61°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in San Diego
San Diego's December 2026 forecast shows daily high temperatures ranging from 60° to 69°, with overnight lows between 44° and 56°. The average high for December is 64° with an average low of 50°. 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 Diego. See also: January | February | March.
