S
M
T
W
T
F
S
29
46°
34°
30
46°
33°
1
45°
35°
2
47°
24°
3
47°
21°
4
46°
20°
5
37°
22°
6
38°
21°
7
39°
19°
8
40°
18°
9
38°
17°
10
34°
18°
11
33°
19°
12
35°
19°
13
36°
21°
14
38°
22°
15
42°
24°
16
43°
25°
17
43°
30°
18
42°
30°
19
40°
28°
20
39°
25°
21
38°
23°
22
37°
28°
23
40°
20°
24
39°
19°
25
35°
20°
26
33°
19°
27
34°
18°
28
33°
17°
29
34°
22°
30
38°
13°
31
35°
12°
1
Hist. Avg.
36°
19°
2
Hist. Avg.
35°
19°
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 33° to 47°, with overnight lows between 12° and 35°. The average high for December is 39° with an average low of 22°. 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.
