S
M
T
W
T
F
S
29
50°
28°
30
48°
28°
1
40°
27°
2
49°
27°
3
43°
26°
4
40°
26°
5
45°
27°
6
40°
27°
7
42°
26°
8
44°
26°
9
40°
25°
10
38°
26°
11
36°
25°
12
37°
24°
13
33°
20°
14
35°
24°
15
40°
24°
16
39°
25°
17
41°
24°
18
42°
23°
19
40°
23°
20
33°
22°
21
31°
22°
22
40°
23°
23
37°
22°
24
31°
21°
25
26°
13°
26
29°
18°
27
34°
16°
28
32°
13°
29
33°
14°
30
32°
4°
31
27°
2°
1
19°
4°
2
21°
4°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Walnut
Walnut's December 2026 forecast shows daily high temperatures ranging from 19° to 50°, with overnight lows between 2° and 28°. The average high for December is 37° with an average low of 21°. 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 Walnut. See also: January | February | March.
