S
M
T
W
T
F
S
29
36°
24°
30
36°
28°
1
37°
25°
2
38°
27°
3
36°
27°
4
38°
24°
5
38°
24°
6
37°
25°
7
37°
21°
8
38°
29°
9
39°
31°
10
43°
27°
11
48°
23°
12
32°
23°
13
45°
30°
14
46°
30°
15
Hist. Avg.
39°
23°
16
Hist. Avg.
39°
23°
17
Hist. Avg.
39°
23°
18
Hist. Avg.
38°
22°
19
Hist. Avg.
38°
22°
20
Hist. Avg.
38°
22°
21
Hist. Avg.
38°
22°
22
Hist. Avg.
37°
22°
23
Hist. Avg.
37°
21°
24
Hist. Avg.
37°
21°
25
Hist. Avg.
36°
21°
26
Hist. Avg.
36°
21°
27
Hist. Avg.
36°
20°
28
Hist. Avg.
36°
20°
29
Hist. Avg.
36°
20°
30
Hist. Avg.
36°
20°
31
Hist. Avg.
35°
20°
1
Hist. Avg.
35°
20°
2
Hist. Avg.
35°
19°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Walnut
Walnut's December 2026 forecast shows daily high temperatures ranging from 32° to 48°, with overnight lows between 21° and 31°. The average high for December is 39° with an average low of 26°. 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.
