S
M
T
W
T
F
S
29
54°
33°
30
48°
31°
1
44°
31°
2
43°
34°
3
45°
30°
4
46°
25°
5
44°
30°
6
43°
31°
7
42°
25°
8
43°
21°
9
41°
20°
10
37°
19°
11
36°
27°
12
49°
26°
13
Hist. Avg.
45°
24°
14
Hist. Avg.
45°
24°
15
Hist. Avg.
44°
24°
16
Hist. Avg.
44°
23°
17
Hist. Avg.
44°
23°
18
Hist. Avg.
43°
23°
19
Hist. Avg.
43°
22°
20
Hist. Avg.
43°
22°
21
Hist. Avg.
42°
22°
22
Hist. Avg.
42°
21°
23
Hist. Avg.
42°
21°
24
Hist. Avg.
42°
21°
25
Hist. Avg.
41°
20°
26
Hist. Avg.
41°
20°
27
Hist. Avg.
41°
20°
28
Hist. Avg.
41°
20°
29
Hist. Avg.
40°
20°
30
Hist. Avg.
40°
19°
31
Hist. Avg.
40°
19°
1
Hist. Avg.
40°
19°
2
Hist. Avg.
40°
19°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Cohasset
Cohasset's December 2026 forecast shows daily high temperatures ranging from 36° to 54°, with overnight lows between 19° and 34°. The average high for December is 44° with an average low of 27°. 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 Cohasset. See also: January | February | March.
