S
M
T
W
T
F
S
29
49°
36°
30
47°
38°
1
47°
36°
2
48°
36°
3
47°
38°
4
46°
37°
5
46°
34°
6
46°
34°
7
47°
35°
8
46°
37°
9
46°
35°
10
47°
33°
11
46°
35°
12
46°
35°
13
47°
36°
14
46°
36°
15
46°
35°
16
47°
34°
17
46°
34°
18
45°
35°
19
45°
35°
20
46°
34°
21
45°
34°
22
45°
35°
23
46°
36°
24
45°
38°
25
46°
37°
26
47°
34°
27
46°
39°
28
45°
40°
29
49°
42°
30
50°
40°
31
51°
39°
1
Hist. Avg.
45°
36°
2
Hist. Avg.
45°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Llantwit Major
Llantwit Major's December 2026 forecast shows daily high temperatures ranging from 45° to 51°, with overnight lows between 33° and 42°. The average high for December is 47° with an average low of 36°. 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 Llantwit Major. See also: January | February | March.
