S
M
T
W
T
F
S
29
65°
45°
30
71°
53°
1
71°
47°
2
70°
37°
3
66°
41°
4
61°
35°
5
58°
31°
6
54°
37°
7
53°
38°
8
52°
32°
9
54°
31°
10
53°
42°
11
57°
41°
12
56°
39°
13
58°
36°
14
64°
35°
15
57°
40°
16
57°
42°
17
51°
46°
18
59°
47°
19
65°
47°
20
66°
46°
21
66°
46°
22
64°
45°
23
68°
43°
24
64°
38°
25
60°
36°
26
59°
44°
27
58°
47°
28
64°
43°
29
65°
43°
30
62°
34°
31
63°
33°
1
52°
32°
2
47°
31°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Plano
Plano's December 2026 forecast shows daily high temperatures ranging from 47° to 71°, with overnight lows between 31° and 53°. The average high for December is 60° with an average low of 40°. 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 Plano. See also: January | February | March.
