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