S
M
T
W
T
F
S
29
49°
38°
30
47°
40°
1
51°
36°
2
52°
35°
3
46°
34°
4
50°
34°
5
48°
33°
6
45°
34°
7
46°
33°
8
45°
32°
9
46°
33°
10
45°
32°
11
45°
31°
12
46°
32°
13
45°
32°
14
45°
33°
15
46°
36°
16
45°
39°
17
46°
39°
18
45°
38°
19
49°
39°
20
50°
38°
21
47°
33°
22
46°
34°
23
44°
38°
24
46°
34°
25
46°
33°
26
43°
32°
27
43°
32°
28
Hist. Avg.
46°
37°
29
Hist. Avg.
46°
37°
30
Hist. Avg.
46°
37°
31
Hist. Avg.
46°
36°
1
Hist. Avg.
46°
36°
2
Hist. Avg.
45°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Cardiff
Cardiff's December 2026 forecast shows daily high temperatures ranging from 43° to 52°, with overnight lows between 31° and 40°. The average high for December is 46° with an average low of 35°. 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 Cardiff. See also: January | February | March.
