S
M
T
W
T
F
S
29
47°
38°
30
51°
38°
1
52°
39°
2
51°
38°
3
53°
36°
4
45°
32°
5
49°
35°
6
51°
36°
7
47°
32°
8
41°
30°
9
39°
27°
10
38°
27°
11
37°
32°
12
40°
31°
13
41°
29°
14
34°
22°
15
37°
24°
16
38°
28°
17
40°
30°
18
36°
31°
19
43°
27°
20
40°
18°
21
36°
19°
22
33°
21°
23
31°
25°
24
34°
24°
25
42°
26°
26
37°
19°
27
35°
16°
28
31°
15°
29
31°
13°
30
33°
30°
31
43°
25°
1
49°
18°
2
35°
16°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Marietta
Marietta's December 2026 forecast shows daily high temperatures ranging from 31° to 53°, with overnight lows between 13° and 39°. The average high for December is 41° 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 Marietta. See also: January | February | March.
