S
M
T
W
T
F
S
29
47°
35°
30
51°
35°
1
45°
32°
2
45°
34°
3
46°
34°
4
45°
29°
5
42°
27°
6
41°
33°
7
40°
33°
8
38°
32°
9
40°
32°
10
47°
33°
11
43°
33°
12
39°
29°
13
37°
27°
14
32°
24°
15
33°
31°
16
36°
31°
17
43°
33°
18
45°
32°
19
42°
31°
20
38°
26°
21
32°
23°
22
35°
30°
23
40°
30°
24
39°
29°
25
30°
17°
26
30°
20°
27
34°
24°
28
33°
19°
29
31°
21°
30
32°
17°
31
32°
13°
1
29°
12°
2
26°
13°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Sidney
Sidney's December 2026 forecast shows daily high temperatures ranging from 26° to 51°, with overnight lows between 12° and 35°. The average high for December is 38° with an average low of 27°. 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 Sidney. See also: January | February | March.
