S
M
T
W
T
F
S
29
40°
33°
30
39°
32°
1
41°
35°
2
43°
34°
3
40°
30°
4
39°
30°
5
38°
33°
6
40°
35°
7
39°
36°
8
45°
37°
9
44°
38°
10
46°
39°
11
46°
38°
12
45°
37°
13
45°
38°
14
44°
37°
15
44°
37°
16
42°
36°
17
43°
37°
18
44°
35°
19
40°
32°
20
41°
35°
21
44°
36°
22
44°
37°
23
45°
38°
24
45°
35°
25
41°
32°
26
41°
35°
27
40°
33°
28
41°
35°
29
40°
35°
30
43°
33°
31
42°
31°
1
38°
32°
2
35°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Siek
Siek's December 2026 forecast shows daily high temperatures ranging from 35° to 46°, with overnight lows between 30° and 39°. The average high for December is 42° with an average low of 35°. 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 Siek. See also: January | February | March.
