S
M
T
W
T
F
S
29
48°
41°
30
49°
39°
1
48°
38°
2
45°
38°
3
46°
39°
4
46°
39°
5
45°
38°
6
46°
37°
7
48°
36°
8
45°
35°
9
40°
35°
10
42°
32°
11
38°
36°
12
39°
33°
13
42°
32°
14
41°
35°
15
39°
34°
16
40°
31°
17
41°
34°
18
40°
35°
19
44°
37°
20
45°
36°
21
44°
36°
22
43°
35°
23
41°
38°
24
45°
37°
25
46°
36°
26
46°
30°
27
45°
31°
28
37°
27°
29
37°
25°
30
35°
25°
31
36°
23°
1
35°
25°
2
36°
27°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Sillium
Sillium's December 2026 forecast shows daily high temperatures ranging from 35° to 49°, with overnight lows between 23° and 41°. The average high for December is 42° with an average low of 34°. 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 Sillium. See also: January | February | March.
