S
M
T
W
T
F
S
29
43°
33°
30
47°
29°
1
46°
26°
2
43°
29°
3
42°
26°
4
43°
25°
5
39°
31°
6
43°
37°
7
49°
40°
8
54°
37°
9
55°
35°
10
53°
34°
11
48°
33°
12
46°
30°
13
45°
31°
14
42°
34°
15
46°
33°
16
49°
33°
17
43°
27°
18
43°
26°
19
39°
26°
20
40°
35°
21
48°
33°
22
49°
26°
23
46°
30°
24
41°
34°
25
50°
30°
26
49°
22°
27
45°
27°
28
39°
20°
29
46°
21°
30
36°
19°
31
50°
20°
1
43°
23°
2
41°
27°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Hyannis
Hyannis's December 2026 forecast shows daily high temperatures ranging from 36° to 55°, with overnight lows between 19° and 40°. The average high for December is 45° 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 Hyannis. See also: January | February | March.
