S
M
T
W
T
F
S
29
39°
29°
30
38°
29°
1
39°
30°
2
38°
30°
3
40°
31°
4
41°
31°
5
41°
32°
6
39°
34°
7
40°
37°
8
44°
38°
9
42°
36°
10
43°
34°
11
43°
34°
12
42°
32°
13
39°
29°
14
36°
28°
15
34°
27°
16
34°
27°
17
35°
28°
18
35°
28°
19
36°
30°
20
37°
34°
21
42°
37°
22
44°
37°
23
45°
36°
24
43°
33°
25
34°
32°
26
37°
34°
27
39°
35°
28
39°
36°
29
42°
34°
30
43°
35°
31
42°
35°
1
40°
34°
2
40°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Sinn
Sinn's December 2026 forecast shows daily high temperatures ranging from 34° to 45°, with overnight lows between 27° and 38°. The average high for December is 40° with an average low of 33°. 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 Sinn. See also: January | February | March.
