S
M
T
W
T
F
S
29
42°
21°
30
30°
19°
1
28°
20°
2
40°
22°
3
40°
22°
4
39°
21°
5
36°
20°
6
32°
17°
7
24°
17°
8
38°
20°
9
39°
20°
10
39°
19°
11
38°
19°
12
37°
18°
13
38°
20°
14
33°
15°
15
34°
16°
16
34°
11°
17
32°
9°
18
26°
-1°
19
27°
-2°
20
18°
15°
21
31°
14°
22
32°
10°
23
30°
10°
24
28°
9°
25
31°
14°
26
30°
13°
27
33°
1°
28
30°
-2°
29
21°
0°
30
18°
-5°
31
15°
-3°
1
15°
9°
2
20°
14°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Elgin
Elgin's December 2026 forecast shows daily high temperatures ranging from 15° to 42°, with overnight lows between -5° and 22°. The average high for December is 31° with an average low of 13°. 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 Elgin. See also: January | February | March.
