S
M
T
W
T
F
S
29
47°
33°
30
55°
31°
1
55°
28°
2
49°
34°
3
55°
27°
4
54°
26°
5
41°
25°
6
40°
24°
7
40°
25°
8
41°
30°
9
43°
35°
10
52°
31°
11
51°
31°
12
42°
28°
13
40°
29°
14
40°
26°
15
41°
22°
16
38°
20°
17
36°
22°
18
36°
32°
19
42°
32°
20
43°
27°
21
48°
28°
22
40°
35°
23
49°
36°
24
49°
32°
25
48°
30°
26
47°
30°
27
43°
32°
28
46°
33°
29
47°
33°
30
47°
34°
31
49°
32°
1
49°
30°
2
48°
29°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Mamaroneck
Mamaroneck's December 2026 forecast shows daily high temperatures ranging from 36° to 55°, with overnight lows between 20° and 36°. 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 Mamaroneck. See also: January | February | March.
