S
M
T
W
T
F
S
29
50°
32°
30
46°
28°
1
41°
26°
2
34°
21°
3
38°
29°
4
43°
27°
5
39°
29°
6
35°
20°
7
32°
17°
8
30°
18°
9
36°
20°
10
40°
26°
11
40°
26°
12
44°
25°
13
40°
25°
14
36°
25°
15
41°
21°
16
40°
23°
17
39°
20°
18
35°
16°
19
34°
12°
20
30°
9°
21
28°
21°
22
35°
18°
23
38°
18°
24
35°
13°
25
33°
13°
26
32°
22°
27
34°
18°
28
36°
13°
29
31°
12°
30
30°
17°
31
30°
7°
1
33°
3°
2
26°
8°
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 26° to 50°, with overnight lows between 3° and 32°. The average high for December is 36° with an average low of 19°. 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.
