S
M
T
W
T
F
S
29
54°
38°
30
55°
30°
1
50°
25°
2
40°
25°
3
48°
35°
4
52°
36°
5
46°
36°
6
41°
29°
7
40°
23°
8
37°
23°
9
40°
27°
10
43°
30°
11
47°
29°
12
51°
29°
13
46°
31°
14
44°
26°
15
45°
27°
16
46°
27°
17
39°
20°
18
38°
18°
19
37°
15°
20
34°
13°
21
32°
27°
22
38°
19°
23
39°
22°
24
37°
15°
25
36°
23°
26
36°
27°
27
39°
25°
28
39°
19°
29
37°
21°
30
36°
21°
31
36°
16°
1
35°
12°
2
33°
20°
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 32° to 55°, with overnight lows between 12° and 38°. The average high for December is 41° with an average low of 25°. 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.
