S
M
T
W
T
F
S
29
57°
31°
30
57°
24°
1
54°
21°
2
54°
25°
3
57°
28°
4
56°
25°
5
54°
22°
6
53°
23°
7
53°
20°
8
51°
21°
9
53°
26°
10
56°
27°
11
58°
28°
12
59°
30°
13
59°
30°
14
58°
23°
15
54°
21°
16
56°
21°
17
53°
20°
18
53°
18°
19
52°
19°
20
55°
19°
21
58°
22°
22
55°
19°
23
53°
20°
24
57°
19°
25
57°
22°
26
58°
24°
27
62°
23°
28
53°
21°
29
54°
23°
30
58°
20°
31
59°
22°
1
58°
23°
2
63°
24°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Duncan
Duncan's December 2026 forecast shows daily high temperatures ranging from 51° to 63°, with overnight lows between 18° and 31°. The average high for December is 56° with an average low of 23°. 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 Duncan. See also: January | February | March.
