S
M
T
W
T
F
S
29
55°
33°
30
56°
37°
1
56°
43°
2
63°
36°
3
64°
34°
4
56°
38°
5
57°
34°
6
56°
32°
7
53°
30°
8
54°
29°
9
52°
31°
10
54°
40°
11
59°
40°
12
53°
30°
13
61°
41°
14
61°
43°
15
Hist. Avg.
57°
34°
16
Hist. Avg.
56°
34°
17
Hist. Avg.
56°
34°
18
Hist. Avg.
56°
34°
19
Hist. Avg.
56°
33°
20
Hist. Avg.
55°
33°
21
Hist. Avg.
55°
33°
22
Hist. Avg.
55°
33°
23
Hist. Avg.
55°
33°
24
Hist. Avg.
55°
33°
25
Hist. Avg.
55°
33°
26
Hist. Avg.
54°
33°
27
Hist. Avg.
54°
32°
28
Hist. Avg.
54°
32°
29
Hist. Avg.
54°
32°
30
Hist. Avg.
54°
32°
31
Hist. Avg.
54°
32°
1
Hist. Avg.
54°
32°
2
Hist. Avg.
54°
32°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Sumter
Sumter's December 2026 forecast shows daily high temperatures ranging from 52° to 64°, with overnight lows between 29° and 43°. The average high for December is 57° 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 Sumter. See also: January | February | March.
