S
M
T
W
T
F
S
29
48°
36°
30
50°
30°
1
49°
29°
2
48°
23°
3
49°
18°
4
35°
19°
5
33°
20°
6
34°
21°
7
36°
23°
8
38°
23°
9
37°
27°
10
36°
22°
11
34°
23°
12
34°
24°
13
33°
20°
14
33°
15°
15
30°
11°
16
28°
16°
17
28°
28°
18
41°
28°
19
42°
27°
20
45°
27°
21
42°
29°
22
42°
30°
23
44°
27°
24
44°
23°
25
39°
22°
26
36°
24°
27
39°
28°
28
42°
29°
29
43°
27°
30
44°
25°
31
43°
23°
1
40°
21°
2
32°
19°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Winnetka
Winnetka's December 2026 forecast shows daily high temperatures ranging from 28° to 50°, with overnight lows between 11° and 36°. The average high for December is 39° with an average low of 24°. 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 Winnetka. See also: January | February | March.
