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