S
M
T
W
T
F
S
29
65°
38°
30
68°
35°
1
57°
26°
2
55°
26°
3
57°
33°
4
67°
36°
5
58°
32°
6
56°
29°
7
55°
24°
8
52°
23°
9
53°
24°
10
54°
27°
11
56°
29°
12
60°
32°
13
59°
32°
14
60°
25°
15
57°
28°
16
57°
26°
17
59°
25°
18
56°
22°
19
55°
23°
20
56°
23°
21
59°
28°
22
56°
23°
23
55°
23°
24
56°
26°
25
59°
23°
26
55°
25°
27
59°
30°
28
63°
24°
29
59°
26°
30
56°
23°
31
62°
22°
1
54°
24°
2
57°
32°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Marathon
Marathon's December 2026 forecast shows daily high temperatures ranging from 52° to 68°, with overnight lows between 22° and 38°. The average high for December is 58° 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 Marathon. See also: January | February | March.
