S
M
T
W
T
F
S
29
56°
26°
30
51°
23°
1
40°
23°
2
41°
24°
3
45°
29°
4
48°
37°
5
52°
40°
6
54°
37°
7
56°
35°
8
53°
32°
9
47°
33°
10
45°
25°
11
44°
21°
12
38°
24°
13
39°
21°
14
38°
20°
15
36°
21°
16
39°
19°
17
37°
19°
18
35°
25°
19
42°
26°
20
43°
32°
21
46°
32°
22
49°
31°
23
47°
25°
24
41°
18°
25
36°
20°
26
36°
23°
27
39°
24°
28
44°
21°
29
44°
19°
30
37°
18°
31
36°
22°
1
38°
24°
2
44°
22°
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 35° to 56°, with overnight lows between 18° and 40°. The average high for December is 43° with an average low of 25°. 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.
