S
M
T
W
T
F
S
29
69°
42°
30
68°
41°
1
65°
41°
2
68°
43°
3
69°
42°
4
69°
44°
5
68°
41°
6
67°
41°
7
66°
40°
8
66°
41°
9
67°
42°
10
66°
40°
11
64°
39°
12
64°
42°
13
68°
43°
14
69°
42°
15
69°
43°
16
68°
41°
17
68°
40°
18
66°
36°
19
62°
36°
20
61°
37°
21
61°
35°
22
62°
37°
23
62°
36°
24
63°
35°
25
61°
36°
26
62°
35°
27
61°
34°
28
63°
37°
29
64°
38°
30
63°
40°
31
64°
39°
1
62°
35°
2
63°
37°
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 61° to 69°, with overnight lows between 34° and 44°. The average high for December is 65° 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.
