S
M
T
W
T
F
S
29
45°
28°
30
43°
30°
1
45°
32°
2
43°
32°
3
42°
27°
4
41°
23°
5
37°
21°
6
32°
20°
7
35°
21°
8
35°
24°
9
36°
16°
10
33°
11°
11
26°
10°
12
24°
11°
13
23°
18°
14
25°
17°
15
31°
20°
16
31°
23°
17
30°
22°
18
31°
15°
19
30°
10°
20
24°
11°
21
23°
10°
22
29°
4°
23
37°
26°
24
33°
12°
25
34°
6°
26
Hist. Avg.
31°
15°
27
Hist. Avg.
30°
15°
28
Hist. Avg.
30°
15°
29
Hist. Avg.
30°
15°
30
Hist. Avg.
30°
14°
31
Hist. Avg.
30°
14°
1
Hist. Avg.
30°
14°
2
Hist. Avg.
29°
14°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Beloit
Beloit's December 2026 forecast shows daily high temperatures ranging from 23° to 45°, with overnight lows between 4° and 32°. The average high for December is 33° 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 Beloit. See also: January | February | March.
