S
M
T
W
T
F
S
29
59°
41°
30
61°
39°
1
58°
33°
2
55°
25°
3
45°
28°
4
46°
34°
5
50°
32°
6
48°
28°
7
47°
36°
8
51°
28°
9
54°
28°
10
44°
26°
11
42°
22°
12
40°
24°
13
39°
21°
14
41°
20°
15
38°
21°
16
37°
20°
17
38°
19°
18
39°
18°
19
38°
20°
20
37°
27°
21
38°
31°
22
44°
33°
23
44°
34°
24
45°
33°
25
54°
30°
26
52°
27°
27
46°
31°
28
Hist. Avg.
44°
27°
29
Hist. Avg.
44°
27°
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 Reston
Reston's December 2026 forecast shows daily high temperatures ranging from 37° to 61°, with overnight lows between 18° and 41°. The average high for December is 46° with an average low of 28°. 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 Reston. See also: January | February | March.
