S
M
T
W
T
F
S
29
36°
21°
30
38°
25°
1
42°
29°
2
41°
26°
3
40°
28°
4
45°
31°
5
47°
22°
6
34°
20°
7
34°
24°
8
43°
31°
9
45°
28°
10
40°
29°
11
43°
30°
12
42°
27°
13
37°
22°
14
32°
17°
15
30°
16°
16
30°
18°
17
32°
22°
18
35°
26°
19
41°
26°
20
39°
28°
21
43°
27°
22
35°
22°
23
34°
22°
24
40°
28°
25
29°
13°
26
29°
18°
27
31°
18°
28
30°
25°
29
43°
20°
30
44°
19°
31
32°
19°
1
33°
15°
2
35°
12°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Upper Saddle River
Upper Saddle River's December 2026 forecast shows daily high temperatures ranging from 29° to 47°, with overnight lows between 12° and 31°. The average high for December is 37° with an average low of 23°. 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 Upper Saddle River. See also: January | February | March.
