S
M
T
W
T
F
S
29
43°
16°
30
44°
22°
1
43°
15°
2
41°
13°
3
40°
15°
4
42°
16°
5
42°
15°
6
41°
11°
7
39°
14°
8
40°
12°
9
40°
11°
10
41°
11°
11
38°
12°
12
40°
14°
13
44°
19°
14
46°
17°
15
45°
14°
16
43°
22°
17
47°
24°
18
49°
20°
19
47°
22°
20
44°
21°
21
47°
22°
22
49°
21°
23
43°
21°
24
40°
25°
25
45°
26°
26
48°
24°
27
50°
25°
28
51°
21°
29
50°
15°
30
42°
11°
31
Hist. Avg.
43°
18°
1
Hist. Avg.
43°
18°
2
Hist. Avg.
43°
18°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Castle Pines
Castle Pines's December 2026 forecast shows daily high temperatures ranging from 38° to 51°, with overnight lows between 11° and 26°. The average high for December is 44° with an average low of 18°. 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 Castle Pines. See also: January | February | March.
