S
M
T
W
T
F
S
29
47°
37°
30
49°
31°
1
48°
29°
2
49°
24°
3
48°
20°
4
34°
19°
5
32°
20°
6
33°
21°
7
35°
24°
8
37°
24°
9
36°
27°
10
35°
22°
11
33°
24°
12
32°
24°
13
32°
20°
14
33°
16°
15
29°
12°
16
27°
16°
17
27°
27°
18
40°
28°
19
41°
28°
20
44°
27°
21
41°
29°
22
41°
30°
23
43°
27°
24
42°
23°
25
38°
22°
26
35°
25°
27
38°
29°
28
41°
29°
29
42°
27°
30
43°
26°
31
42°
23°
1
39°
21°
2
31°
20°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Wilmette
Wilmette's December 2026 forecast shows daily high temperatures ranging from 27° to 49°, with overnight lows between 12° and 37°. The average high for December is 38° 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 Wilmette. See also: January | February | March.
