S
M
T
W
T
F
S
29
50°
30°
30
51°
40°
1
54°
43°
2
51°
43°
3
51°
42°
4
54°
44°
5
54°
43°
6
55°
41°
7
59°
40°
8
51°
33°
9
48°
30°
10
48°
34°
11
64°
33°
12
65°
27°
13
64°
25°
14
46°
27°
15
48°
25°
16
50°
27°
17
47°
36°
18
51°
41°
19
61°
42°
20
62°
40°
21
62°
38°
22
60°
44°
23
63°
35°
24
64°
25°
25
63°
23°
26
43°
24°
27
45°
29°
28
51°
40°
29
56°
40°
30
59°
42°
31
60°
43°
1
62°
34°
2
63°
25°
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 43° to 65°, with overnight lows between 23° and 44°. The average high for December is 55° 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 Charleston. See also: January | February | March.
