S
M
T
W
T
F
S
29
42°
26°
30
41°
23°
1
40°
27°
2
41°
21°
3
38°
20°
4
36°
24°
5
39°
31°
6
44°
36°
7
50°
28°
8
53°
26°
9
50°
25°
10
36°
24°
11
39°
22°
12
42°
24°
13
38°
25°
14
36°
22°
15
34°
18°
16
33°
21°
17
33°
23°
18
35°
27°
19
36°
29°
20
42°
30°
21
49°
23°
22
48°
25°
23
37°
30°
24
47°
28°
25
48°
27°
26
43°
27°
27
39°
18°
28
41°
17°
29
31°
12°
30
32°
9°
31
31°
10°
1
25°
12°
2
29°
14°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Marengo
Marengo's December 2026 forecast shows daily high temperatures ranging from 25° to 53°, with overnight lows between 9° and 36°. The average high for December is 39° with an average low of 23°. 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 Marengo. See also: January | February | March.
