S
M
T
W
T
F
S
29
47°
32°
30
50°
36°
1
49°
32°
2
44°
29°
3
46°
37°
4
51°
39°
5
51°
37°
6
52°
33°
7
42°
35°
8
44°
24°
9
40°
24°
10
36°
25°
11
37°
25°
12
37°
26°
13
38°
23°
14
38°
25°
15
43°
34°
16
47°
36°
17
50°
32°
18
40°
30°
19
39°
28°
20
39°
31°
21
39°
24°
22
33°
29°
23
40°
27°
24
39°
20°
25
35°
15°
26
29°
16°
27
29°
22°
28
34°
19°
29
39°
31°
30
45°
17°
31
47°
16°
1
30°
18°
2
29°
18°
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 29° to 52°, with overnight lows between 15° and 39°. The average high for December is 41° 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 Greenwich. See also: January | February | March.
