S
M
T
W
T
F
S
29
43°
26°
30
44°
28°
1
43°
30°
2
42°
30°
3
48°
21°
4
49°
20°
5
34°
27°
6
38°
28°
7
43°
30°
8
47°
31°
9
35°
20°
10
46°
35°
11
48°
31°
12
Hist. Avg.
39°
25°
13
Hist. Avg.
38°
24°
14
Hist. Avg.
38°
24°
15
Hist. Avg.
38°
24°
16
Hist. Avg.
37°
24°
17
Hist. Avg.
37°
23°
18
Hist. Avg.
37°
23°
19
Hist. Avg.
36°
23°
20
Hist. Avg.
36°
23°
21
Hist. Avg.
36°
22°
22
Hist. Avg.
36°
22°
23
Hist. Avg.
36°
22°
24
Hist. Avg.
35°
22°
25
Hist. Avg.
35°
22°
26
Hist. Avg.
35°
21°
27
Hist. Avg.
35°
21°
28
Hist. Avg.
34°
21°
29
Hist. Avg.
34°
21°
30
Hist. Avg.
34°
20°
31
Hist. Avg.
34°
20°
1
Hist. Avg.
34°
20°
2
Hist. Avg.
34°
20°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Decatur
Decatur's December 2026 forecast shows daily high temperatures ranging from 34° to 49°, with overnight lows between 20° and 35°. The average high for December is 43° with an average low of 27°. 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 Decatur. See also: January | February | March.
