S
M
T
W
T
F
S
29
49°
39°
30
58°
35°
1
60°
31°
2
53°
32°
3
56°
26°
4
57°
25°
5
44°
24°
6
42°
23°
7
42°
23°
8
44°
27°
9
43°
27°
10
56°
30°
11
43°
27°
12
43°
27°
13
42°
25°
14
43°
24°
15
41°
21°
16
41°
18°
17
38°
21°
18
39°
31°
19
46°
34°
20
47°
27°
21
53°
28°
22
46°
36°
23
54°
37°
24
55°
34°
25
54°
32°
26
52°
32°
27
46°
34°
28
50°
35°
29
53°
36°
30
53°
37°
31
55°
32°
1
55°
30°
2
51°
29°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Upper Marlboro
Upper Marlboro's December 2026 forecast shows daily high temperatures ranging from 38° to 60°, with overnight lows between 18° and 39°. The average high for December is 49° with an average low of 29°. 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 Upper Marlboro. See also: January | February | March.
