S
M
T
W
T
F
S
29
44°
26°
30
42°
25°
1
42°
25°
2
43°
26°
3
42°
28°
4
44°
31°
5
46°
32°
6
42°
33°
7
41°
31°
8
40°
32°
9
40°
29°
10
41°
29°
11
53°
36°
12
47°
34°
13
54°
29°
14
55°
26°
15
41°
25°
16
42°
24°
17
41°
26°
18
41°
34°
19
48°
35°
20
51°
36°
21
51°
35°
22
52°
33°
23
50°
35°
24
52°
36°
25
55°
29°
26
55°
25°
27
43°
25°
28
41°
29°
29
43°
32°
30
49°
34°
31
49°
36°
1
52°
37°
2
52°
29°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Ashburn
Ashburn's December 2026 forecast shows daily high temperatures ranging from 40° to 55°, with overnight lows between 24° and 37°. The average high for December is 46° with an average low of 30°. 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 Ashburn. See also: January | February | March.
