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