S
M
T
W
T
F
S
29
59°
40°
30
61°
39°
1
58°
42°
2
60°
38°
3
50°
34°
4
52°
31°
5
60°
39°
6
59°
38°
7
46°
34°
8
45°
26°
9
44°
24°
10
43°
26°
11
42°
30°
12
43°
29°
13
43°
28°
14
43°
24°
15
41°
28°
16
44°
32°
17
45°
36°
18
50°
32°
19
52°
23°
20
45°
23°
21
42°
22°
22
38°
22°
23
42°
30°
24
42°
24°
25
43°
23°
26
39°
19°
27
38°
21°
28
38°
18°
29
39°
22°
30
41°
29°
31
46°
24°
1
49°
19°
2
39°
17°
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 38° to 61°, with overnight lows between 17° and 42°. The average high for December is 46° with an average low of 28°. 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.
