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