S
M
T
W
T
F
S
29
46°
36°
30
52°
40°
1
50°
39°
2
47°
39°
3
47°
38°
4
48°
38°
5
50°
37°
6
56°
38°
7
55°
36°
8
53°
30°
9
45°
28°
10
45°
36°
11
56°
22°
12
54°
18°
13
40°
17°
14
39°
26°
15
43°
24°
16
42°
31°
17
49°
33°
18
51°
34°
19
54°
33°
20
54°
32°
21
53°
33°
22
53°
33°
23
57°
19°
24
53°
16°
25
41°
17°
26
37°
23°
27
42°
32°
28
48°
33°
29
56°
37°
30
56°
37°
31
57°
32°
1
58°
22°
2
57°
18°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Delaware
Delaware's December 2026 forecast shows daily high temperatures ranging from 37° to 58°, with overnight lows between 16° and 40°. The average high for December is 50° with an average low of 30°. 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 Delaware. See also: January | February | March.
