S
M
T
W
T
F
S
29
36°
26°
30
34°
16°
1
26°
11°
2
28°
6°
3
25°
3°
4
22°
7°
5
21°
15°
6
25°
15°
7
26°
14°
8
27°
10°
9
26°
5°
10
23°
9°
11
22°
15°
12
27°
13°
13
29°
4°
14
22°
0°
15
18°
-1°
16
13°
12°
17
29°
18°
18
32°
19°
19
32°
17°
20
36°
17°
21
31°
18°
22
34°
15°
23
33°
14°
24
28°
12°
25
25°
14°
26
28°
14°
27
29°
13°
28
29°
13°
29
24°
12°
30
26°
9°
31
26°
5°
1
19°
6°
2
17°
8°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Wheaton
Wheaton's December 2026 forecast shows daily high temperatures ranging from 13° to 36°, with overnight lows between -1° and 26°. The average high for December is 27° with an average low of 12°. 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 Wheaton. See also: January | February | March.
