S
M
T
W
T
F
S
29
64°
47°
30
63°
46°
1
63°
44°
2
62°
47°
3
62°
45°
4
56°
40°
5
57°
43°
6
57°
46°
7
56°
41°
8
57°
43°
9
55°
46°
10
53°
39°
11
54°
38°
12
52°
39°
13
53°
38°
14
52°
37°
15
53°
38°
16
53°
38°
17
54°
39°
18
56°
38°
19
56°
43°
20
57°
40°
21
58°
41°
22
58°
40°
23
57°
38°
24
53°
37°
25
52°
36°
26
52°
36°
27
54°
37°
28
56°
38°
29
59°
39°
30
59°
39°
31
58°
45°
1
58°
46°
2
58°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Fairfax
Fairfax's December 2026 forecast shows daily high temperatures ranging from 52° to 64°, with overnight lows between 36° and 47°. The average high for December is 56° with an average low of 41°. 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 Fairfax. See also: January | February | March.
