S
M
T
W
T
F
S
29
37°
12°
30
36°
5°
1
33°
4°
2
34°
8°
3
40°
8°
4
35°
6°
5
33°
5°
6
33°
4°
7
32°
2°
8
33°
5°
9
40°
7°
10
43°
6°
11
43°
8°
12
44°
16°
13
43°
11°
14
35°
11°
15
36°
15°
16
36°
8°
17
33°
2°
18
32°
5°
19
33°
6°
20
33°
10°
21
37°
8°
22
34°
3°
23
34°
13°
24
36°
5°
25
34°
12°
26
36°
15°
27
42°
11°
28
38°
7°
29
33°
7°
30
34°
1°
31
32°
4°
1
33°
8°
2
41°
13°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Hillside
Hillside's December 2026 forecast shows daily high temperatures ranging from 32° to 44°, with overnight lows between 1° and 16°. The average high for December is 36° with an average low of 8°. 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 Hillside. See also: January | February | March.
