S
M
T
W
T
F
S
29
55°
38°
30
50°
38°
1
50°
36°
2
51°
37°
3
52°
40°
4
50°
41°
5
49°
38°
6
53°
39°
7
52°
45°
8
53°
44°
9
49°
46°
10
52°
47°
11
55°
46°
12
55°
44°
13
54°
44°
14
53°
43°
15
55°
45°
16
56°
44°
17
54°
40°
18
50°
41°
19
48°
43°
20
47°
42°
21
54°
38°
22
54°
44°
23
49°
46°
24
54°
44°
25
55°
42°
26
52°
44°
27
51°
40°
28
52°
38°
29
50°
37°
30
49°
44°
31
52°
45°
1
Hist. Avg.
51°
40°
2
Hist. Avg.
51°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Mendocino
Mendocino's December 2026 forecast shows daily high temperatures ranging from 47° to 56°, with overnight lows between 36° and 47°. The average high for December is 52° with an average low of 42°. 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 Mendocino. See also: January | February | March.
