S
M
T
W
T
F
S
29
50°
37°
30
51°
36°
1
50°
37°
2
51°
35°
3
40°
33°
4
44°
30°
5
48°
34°
6
48°
33°
7
39°
29°
8
36°
22°
9
34°
21°
10
35°
24°
11
36°
32°
12
38°
27°
13
39°
25°
14
35°
19°
15
34°
23°
16
36°
28°
17
40°
29°
18
41°
27°
19
40°
20°
20
37°
19°
21
33°
17°
22
31°
21°
23
32°
27°
24
35°
24°
25
35°
17°
26
34°
12°
27
31°
16°
28
30°
14°
29
30°
12°
30
31°
22°
31
36°
19°
1
38°
14°
2
30°
10°
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 30° to 51°, with overnight lows between 10° and 37°. The average high for December is 38° with an average low of 24°. 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.
