S
M
T
W
T
F
S
29
43°
25°
30
44°
27°
1
42°
30°
2
41°
29°
3
50°
22°
4
51°
20°
5
37°
26°
6
39°
25°
7
45°
28°
8
49°
31°
9
36°
19°
10
47°
35°
11
50°
34°
12
Hist. Avg.
41°
25°
13
Hist. Avg.
40°
25°
14
Hist. Avg.
40°
24°
15
Hist. Avg.
40°
24°
16
Hist. Avg.
39°
24°
17
Hist. Avg.
39°
24°
18
Hist. Avg.
39°
24°
19
Hist. Avg.
38°
23°
20
Hist. Avg.
38°
23°
21
Hist. Avg.
38°
23°
22
Hist. Avg.
38°
22°
23
Hist. Avg.
37°
22°
24
Hist. Avg.
37°
22°
25
Hist. Avg.
37°
22°
26
Hist. Avg.
37°
22°
27
Hist. Avg.
36°
21°
28
Hist. Avg.
36°
21°
29
Hist. Avg.
36°
21°
30
Hist. Avg.
36°
21°
31
Hist. Avg.
36°
20°
1
Hist. Avg.
36°
20°
2
Hist. Avg.
35°
20°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Sidney
Sidney's December 2026 forecast shows daily high temperatures ranging from 36° to 51°, with overnight lows between 19° and 35°. The average high for December is 44° 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.
