S
M
T
W
T
F
S
29
40°
29°
30
45°
34°
1
49°
33°
2
48°
29°
3
39°
32°
4
46°
34°
5
50°
26°
6
38°
24°
7
37°
29°
8
46°
34°
9
49°
31°
10
45°
32°
11
47°
34°
12
48°
32°
13
43°
27°
14
39°
21°
15
34°
19°
16
33°
22°
17
36°
29°
18
41°
31°
19
46°
30°
20
43°
30°
21
47°
29°
22
45°
29°
23
39°
27°
24
43°
32°
25
33°
19°
26
33°
25°
27
36°
22°
28
38°
29°
29
44°
27°
30
47°
25°
31
41°
27°
1
39°
25°
2
44°
20°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Arlington
Arlington's December 2026 forecast shows daily high temperatures ranging from 33° to 50°, with overnight lows between 19° and 34°. The average high for December is 42° 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 Arlington. See also: January | February | March.
