S
M
T
W
T
F
S
29
38°
23°
30
37°
23°
1
37°
22°
2
38°
27°
3
39°
30°
4
41°
30°
5
43°
33°
6
43°
31°
7
41°
32°
8
36°
30°
9
35°
27°
10
34°
26°
11
47°
31°
12
45°
27°
13
48°
24°
14
42°
20°
15
36°
23°
16
35°
21°
17
33°
24°
18
38°
30°
19
40°
31°
20
45°
32°
21
46°
31°
22
47°
31°
23
45°
33°
24
48°
29°
25
48°
22°
26
46°
21°
27
32°
20°
28
35°
29°
29
43°
29°
30
44°
32°
31
46°
33°
1
47°
28°
2
47°
22°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Walnut Creek
Walnut Creek's December 2026 forecast shows daily high temperatures ranging from 32° to 48°, with overnight lows between 20° and 33°. The average high for December is 41° with an average low of 27°. 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 Creek. See also: January | February | March.
