S
M
T
W
T
F
S
29
71°
45°
30
70°
44°
1
71°
43°
2
68°
44°
3
68°
39°
4
64°
39°
5
63°
40°
6
65°
40°
7
65°
41°
8
64°
39°
9
62°
43°
10
63°
39°
11
63°
35°
12
62°
35°
13
60°
36°
14
62°
36°
15
63°
37°
16
62°
36°
17
62°
37°
18
63°
37°
19
63°
38°
20
64°
39°
21
65°
41°
22
65°
43°
23
64°
36°
24
66°
36°
25
63°
37°
26
61°
37°
27
62°
38°
28
64°
38°
29
65°
40°
30
67°
40°
31
66°
41°
1
65°
38°
2
66°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Oceanside
Oceanside's December 2026 forecast shows daily high temperatures ranging from 60° to 71°, with overnight lows between 35° and 45°. The average high for December is 64° with an average low of 39°. 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 Oceanside. See also: January | February | March.
