S
M
T
W
T
F
S
30
58°
49°
1
58°
48°
2
60°
51°
3
76°
52°
4
84°
57°
5
63°
53°
6
64°
52°
7
60°
50°
8
71°
52°
9
62°
50°
10
64°
49°
11
62°
54°
12
80°
54°
13
74°
57°
14
60°
54°
15
59°
53°
16
64°
54°
17
76°
52°
18
86°
63°
19
82°
60°
20
62°
55°
21
59°
53°
22
63°
52°
23
61°
54°
24
61°
54°
25
58°
53°
26
60°
52°
27
62°
54°
28
69°
55°
29
72°
59°
30
67°
56°
31
61°
53°
1
62°
54°
2
65°
56°
3
66°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Mortlake
Mortlake's December 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for December is ° with an average low of °. 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 Mortlake. See also: January | February | March.