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