S
M
T
W
T
F
S
29
48°
40°
30
47°
40°
1
52°
39°
2
52°
38°
3
46°
36°
4
49°
36°
5
46°
36°
6
46°
36°
7
47°
35°
8
46°
34°
9
47°
35°
10
45°
34°
11
45°
34°
12
46°
35°
13
45°
34°
14
45°
36°
15
46°
37°
16
45°
41°
17
46°
41°
18
46°
40°
19
49°
40°
20
50°
41°
21
47°
36°
22
46°
36°
23
44°
41°
24
47°
37°
25
49°
35°
26
45°
34°
27
50°
40°
28
50°
41°
29
Hist. Avg.
46°
37°
30
Hist. Avg.
46°
37°
31
Hist. Avg.
46°
37°
1
Hist. Avg.
46°
37°
2
Hist. Avg.
46°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in The Mumbles
The Mumbles's December 2026 forecast shows daily high temperatures ranging from 44° to 52°, with overnight lows between 34° and 41°. The average high for December is 47° with an average low of 37°. 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 The Mumbles. See also: January | February | March.
