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