S
M
T
W
T
F
S
29
47°
29°
30
41°
28°
1
41°
32°
2
45°
34°
3
44°
33°
4
45°
31°
5
41°
30°
6
36°
29°
7
35°
27°
8
37°
23°
9
30°
23°
10
30°
21°
11
31°
21°
12
34°
23°
13
36°
23°
14
36°
27°
15
35°
27°
16
39°
26°
17
40°
26°
18
40°
25°
19
36°
22°
20
31°
19°
21
27°
19°
22
33°
11°
23
30°
10°
24
26°
9°
25
25°
8°
26
24°
14°
27
25°
18°
28
38°
22°
29
34°
7°
30
38°
6°
31
23°
4°
1
21°
4°
2
19°
6°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Algonquin
Algonquin's December 2026 forecast shows daily high temperatures ranging from 19° to 47°, with overnight lows between 4° and 34°. The average high for December is 34° with an average low of 20°. 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 Algonquin. See also: January | February | March.
