S
M
T
W
T
F
S
29
67°
46°
30
68°
47°
1
65°
47°
2
66°
45°
3
68°
44°
4
71°
47°
5
70°
39°
6
65°
40°
7
65°
44°
8
66°
43°
9
65°
38°
10
63°
42°
11
63°
41°
12
64°
39°
13
64°
39°
14
65°
38°
15
63°
38°
16
64°
39°
17
64°
40°
18
66°
44°
19
67°
38°
20
64°
36°
21
62°
37°
22
63°
38°
23
63°
37°
24
64°
38°
25
63°
38°
26
64°
39°
27
65°
38°
28
66°
37°
29
64°
36°
30
63°
38°
31
64°
40°
1
66°
40°
2
68°
41°
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 62° to 71°, with overnight lows between 36° and 47°. The average high for December is 65° with an average low of 40°. 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.
