S
M
T
W
T
F
S
29
34°
22°
30
38°
20°
1
36°
15°
2
32°
17°
3
33°
15°
4
37°
12°
5
30°
17°
6
32°
26°
7
37°
28°
8
43°
27°
9
46°
24°
10
44°
23°
11
38°
22°
12
36°
19°
13
36°
19°
14
32°
22°
15
32°
21°
16
33°
21°
17
34°
15°
18
33°
14°
19
29°
12°
20
33°
21°
21
34°
20°
22
38°
8°
23
37°
10°
24
28°
22°
25
38°
16°
26
38°
5°
27
36°
10°
28
24°
2°
29
31°
3°
30
24°
8°
31
38°
9°
1
36°
3°
2
31°
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 24° to 46°, with overnight lows between 2° and 28°. The average high for December is 35° with an average low of 16°. 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.
