S
M
T
W
T
F
S
29
48°
38°
30
49°
38°
1
48°
35°
2
48°
36°
3
45°
36°
4
47°
35°
5
46°
35°
6
40°
32°
7
36°
27°
8
33°
23°
9
33°
27°
10
39°
31°
11
40°
33°
12
42°
32°
13
39°
32°
14
33°
27°
15
36°
27°
16
40°
29°
17
41°
30°
18
35°
25°
19
36°
22°
20
33°
18°
21
33°
19°
22
29°
23°
23
36°
27°
24
35°
25°
25
36°
15°
26
33°
14°
27
28°
13°
28
28°
13°
29
29°
16°
30
28°
23°
31
28°
18°
1
34°
13°
2
27°
12°
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 27° to 49°, with overnight lows between 12° and 38°. The average high for December is 37° 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 Ashburn. See also: January | February | March.
