S
M
T
W
T
F
S
29
43°
34°
30
44°
30°
1
42°
30°
2
44°
34°
3
47°
19°
4
51°
17°
5
34°
19°
6
31°
18°
7
33°
21°
8
34°
16°
9
34°
14°
10
30°
14°
11
28°
17°
12
29°
17°
13
32°
18°
14
32°
20°
15
34°
22°
16
37°
21°
17
36°
23°
18
38°
29°
19
38°
27°
20
37°
27°
21
35°
23°
22
36°
20°
23
33°
24°
24
35°
16°
25
35°
22°
26
32°
23°
27
31°
17°
28
33°
16°
29
33°
19°
30
30°
15°
31
31°
9°
1
Hist. Avg.
33°
18°
2
Hist. Avg.
33°
18°
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 28° to 51°, with overnight lows between 9° and 34°. The average high for December is 36° with an average low of 21°. 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.
