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