S
M
T
W
T
F
S
29
68°
58°
30
69°
56°
1
70°
56°
2
70°
54°
3
69°
47°
4
67°
41°
5
58°
40°
6
56°
39°
7
53°
40°
8
53°
42°
9
58°
42°
10
64°
41°
11
54°
41°
12
55°
44°
13
56°
41°
14
56°
39°
15
54°
40°
16
53°
40°
17
54°
41°
18
54°
43°
19
56°
48°
20
60°
51°
21
65°
52°
22
65°
54°
23
66°
53°
24
66°
52°
25
65°
50°
26
66°
50°
27
64°
49°
28
62°
52°
29
64°
53°
30
66°
52°
31
67°
48°
1
66°
46°
2
62°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Charleston
Charleston's December 2026 forecast shows daily high temperatures ranging from 53° to 70°, with overnight lows between 39° and 58°. The average high for December is 61° 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 Charleston. See also: January | February | March.
