S
M
T
W
T
F
S
29
43°
28°
30
41°
26°
1
33°
26°
2
32°
18°
3
31°
24°
4
34°
24°
5
34°
23°
6
31°
16°
7
26°
9°
8
24°
10°
9
26°
11°
10
32°
20°
11
33°
20°
12
36°
22°
13
33°
22°
14
25°
21°
15
34°
16°
16
34°
18°
17
31°
17°
18
30°
14°
19
29°
11°
20
27°
5°
21
24°
16°
22
29°
14°
23
32°
16°
24
29°
11°
25
31°
8°
26
27°
16°
27
26°
16°
28
31°
12°
29
27°
8°
30
26°
11°
31
25°
2°
1
28°
-2°
2
18°
2°
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 18° to 43°, with overnight lows between -2° and 28°. The average high for December is 30° with an average low of 15°. 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.
