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