S
M
T
W
T
F
S
29
50°
34°
30
49°
27°
1
41°
21°
2
35°
19°
3
42°
32°
4
45°
32°
5
41°
31°
6
36°
26°
7
35°
21°
8
33°
21°
9
38°
24°
10
40°
29°
11
42°
28°
12
47°
27°
13
43°
29°
14
39°
25°
15
41°
24°
16
41°
23°
17
37°
18°
18
34°
14°
19
33°
12°
20
31°
10°
21
28°
24°
22
35°
16°
23
36°
18°
24
35°
10°
25
31°
19°
26
31°
25°
27
37°
23°
28
37°
18°
29
34°
16°
30
31°
17°
31
31°
9°
1
32°
6°
2
28°
13°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Effingham
Effingham's December 2026 forecast shows daily high temperatures ranging from 28° to 50°, with overnight lows between 6° and 34°. The average high for December is 37° with an average low of 21°. 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 Effingham. See also: January | February | March.
