S
M
T
W
T
F
S
29
46°
28°
30
51°
33°
1
56°
29°
2
55°
24°
3
45°
32°
4
53°
37°
5
56°
40°
6
58°
35°
7
59°
32°
8
52°
32°
9
53°
33°
10
55°
36°
11
54°
35°
12
54°
32°
13
50°
25°
14
44°
28°
15
43°
26°
16
46°
33°
17
51°
34°
18
51°
37°
19
53°
35°
20
58°
29°
21
55°
27°
22
47°
28°
23
44°
22°
24
41°
28°
25
42°
27°
26
42°
18°
27
41°
17°
28
38°
25°
29
41°
16°
30
40°
15°
31
37°
18°
1
36°
25°
2
Hist. Avg.
45°
24°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Dennis
Dennis's December 2026 forecast shows daily high temperatures ranging from 36° to 59°, with overnight lows between 15° and 40°. The average high for December is 48° with an average low of 29°. 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 Dennis. See also: January | February | March.
