S
M
T
W
T
F
S
29
45°
32°
30
45°
29°
1
43°
28°
2
41°
29°
3
43°
28°
4
42°
30°
5
40°
33°
6
44°
39°
7
48°
42°
8
55°
37°
9
56°
35°
10
45°
31°
11
43°
33°
12
43°
30°
13
44°
31°
14
42°
27°
15
43°
26°
16
41°
26°
17
37°
25°
18
38°
24°
19
37°
23°
20
38°
36°
21
45°
31°
22
48°
28°
23
42°
34°
24
42°
35°
25
50°
32°
26
46°
25°
27
42°
28°
28
43°
23°
29
42°
24°
30
34°
19°
31
48°
18°
1
34°
22°
2
36°
23°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Passaic
Passaic's December 2026 forecast shows daily high temperatures ranging from 34° to 56°, with overnight lows between 18° and 42°. The average high for December is 43° 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 Passaic. See also: January | February | March.
