S
M
T
W
T
F
S
29
55°
35°
30
54°
37°
1
55°
45°
2
55°
35°
3
64°
33°
4
53°
35°
5
54°
36°
6
53°
34°
7
54°
34°
8
52°
35°
9
55°
33°
10
52°
30°
11
50°
30°
12
49°
32°
13
51°
32°
14
52°
33°
15
53°
35°
16
52°
34°
17
51°
34°
18
52°
39°
19
56°
36°
20
57°
37°
21
58°
40°
22
58°
43°
23
52°
34°
24
55°
35°
25
50°
35°
26
49°
31°
27
49°
30°
28
50°
31°
29
52°
34°
30
53°
28°
31
53°
27°
1
Hist. Avg.
57°
37°
2
Hist. Avg.
57°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Richardson
Richardson's December 2026 forecast shows daily high temperatures ranging from 49° to 64°, with overnight lows between 27° and 45°. The average high for December is 53° with an average low of 34°. 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 Richardson. See also: January | February | March.
