S
M
T
W
T
F
S
29
41°
27°
30
43°
30°
1
46°
35°
2
45°
32°
3
45°
34°
4
49°
37°
5
51°
28°
6
39°
26°
7
38°
31°
8
48°
37°
9
50°
35°
10
45°
36°
11
48°
35°
12
47°
33°
13
42°
28°
14
37°
24°
15
35°
23°
16
35°
24°
17
37°
28°
18
40°
33°
19
46°
32°
20
43°
35°
21
48°
33°
22
40°
29°
23
39°
29°
24
45°
31°
25
32°
21°
26
34°
24°
27
34°
25°
28
35°
31°
29
47°
26°
30
48°
25°
31
36°
25°
1
37°
22°
2
39°
19°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Greenwich
Greenwich's December 2026 forecast shows daily high temperatures ranging from 32° to 51°, with overnight lows between 19° and 37°. The average high for December is 42° 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 Greenwich. See also: January | February | March.
