S
M
T
W
T
F
S
29
60°
42°
30
61°
40°
1
59°
34°
2
56°
26°
3
45°
29°
4
46°
35°
5
51°
33°
6
48°
29°
7
47°
37°
8
52°
29°
9
54°
29°
10
44°
27°
11
42°
22°
12
40°
24°
13
39°
22°
14
41°
21°
15
38°
21°
16
37°
20°
17
38°
20°
18
40°
18°
19
38°
21°
20
37°
28°
21
38°
32°
22
44°
34°
23
45°
35°
24
46°
34°
25
55°
31°
26
53°
28°
27
42°
28°
28
37°
25°
29
41°
34°
30
Hist. Avg.
44°
27°
31
Hist. Avg.
43°
27°
1
Hist. Avg.
43°
26°
2
Hist. Avg.
43°
26°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Chantilly
Chantilly's December 2026 forecast shows daily high temperatures ranging from 37° to 61°, with overnight lows between 18° and 42°. The average high for December is 46° with an average low of 29°. 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 Chantilly. See also: January | February | March.
