S
M
T
W
T
F
S
29
64°
50°
30
64°
45°
1
65°
44°
2
65°
45°
3
63°
47°
4
67°
47°
5
68°
48°
6
69°
50°
7
69°
48°
8
63°
43°
9
65°
45°
10
69°
50°
11
70°
50°
12
69°
49°
13
68°
48°
14
69°
47°
15
68°
46°
16
70°
43°
17
66°
45°
18
64°
44°
19
65°
46°
20
67°
46°
21
67°
44°
22
68°
46°
23
65°
46°
24
66°
47°
25
69°
49°
26
69°
43°
27
67°
45°
28
64°
47°
29
65°
49°
30
69°
49°
31
71°
48°
1
72°
50°
2
71°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in National City
National City's December 2026 forecast shows daily high temperatures ranging from 63° to 72°, with overnight lows between 42° and 50°. The average high for December is 67° with an average low of 47°. 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 National City. See also: January | February | March.
