S
M
T
W
T
F
S
29
50°
26°
30
48°
23°
1
36°
26°
2
37°
28°
3
43°
30°
4
45°
35°
5
46°
36°
6
46°
35°
7
48°
34°
8
46°
31°
9
42°
30°
10
41°
24°
11
37°
20°
12
33°
23°
13
34°
20°
14
32°
21°
15
31°
22°
16
33°
17°
17
31°
19°
18
29°
26°
19
35°
28°
20
39°
30°
21
42°
30°
22
41°
24°
23
40°
19°
24
34°
16°
25
28°
20°
26
29°
24°
27
33°
25°
28
40°
19°
29
35°
20°
30
30°
19°
31
31°
26°
1
34°
25°
2
38°
22°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in O'Hare
O'Hare's December 2026 forecast shows daily high temperatures ranging from 28° to 50°, with overnight lows between 16° and 36°. The average high for December is 38° with an average low of 25°. 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 O'Hare. See also: January | February | March.
