S
M
T
W
T
F
S
29
51°
27°
30
44°
25°
1
43°
29°
2
42°
30°
3
45°
28°
4
45°
26°
5
42°
23°
6
41°
22°
7
40°
21°
8
36°
20°
9
38°
17°
10
37°
18°
11
34°
26°
12
42°
23°
13
45°
30°
14
45°
25°
15
Hist. Avg.
43°
24°
16
Hist. Avg.
42°
24°
17
Hist. Avg.
42°
24°
18
Hist. Avg.
42°
24°
19
Hist. Avg.
41°
23°
20
Hist. Avg.
41°
23°
21
Hist. Avg.
41°
23°
22
Hist. Avg.
41°
23°
23
Hist. Avg.
40°
22°
24
Hist. Avg.
40°
22°
25
Hist. Avg.
40°
22°
26
Hist. Avg.
40°
22°
27
Hist. Avg.
40°
22°
28
Hist. Avg.
40°
22°
29
Hist. Avg.
39°
21°
30
Hist. Avg.
39°
21°
31
Hist. Avg.
39°
21°
1
Hist. Avg.
39°
21°
2
Hist. Avg.
39°
21°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Mendham
Mendham's December 2026 forecast shows daily high temperatures ranging from 34° to 51°, with overnight lows between 17° and 30°. The average high for December is 42° with an average low of 24°. 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 Mendham. See also: January | February | March.
