S
M
T
W
T
F
S
29
36°
24°
30
35°
23°
1
34°
25°
2
35°
30°
3
37°
30°
4
40°
31°
5
40°
33°
6
41°
33°
7
40°
32°
8
37°
30°
9
35°
28°
10
32°
29°
11
42°
27°
12
39°
27°
13
39°
23°
14
36°
18°
15
34°
20°
16
30°
21°
17
30°
24°
18
34°
27°
19
35°
30°
20
39°
31°
21
40°
30°
22
41°
30°
23
40°
31°
24
44°
25°
25
42°
21°
26
38°
17°
27
28°
16°
28
30°
28°
29
38°
27°
30
39°
30°
31
41°
31°
1
41°
28°
2
42°
21°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Pontiac
Pontiac's December 2026 forecast shows daily high temperatures ranging from 28° to 44°, with overnight lows between 16° and 33°. The average high for December is 37° with an average low of 27°. 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 Pontiac. See also: January | February | March.
