S
M
T
W
T
F
S
29
49°
25°
30
51°
24°
1
51°
23°
2
50°
23°
3
49°
20°
4
47°
24°
5
49°
25°
6
52°
23°
7
47°
20°
8
46°
19°
9
46°
18°
10
45°
15°
11
47°
21°
12
45°
12°
13
46°
19°
14
48°
20°
15
50°
20°
16
Hist. Avg.
41°
13°
17
Hist. Avg.
41°
13°
18
Hist. Avg.
41°
13°
19
Hist. Avg.
40°
13°
20
Hist. Avg.
40°
13°
21
Hist. Avg.
40°
12°
22
Hist. Avg.
40°
12°
23
Hist. Avg.
40°
12°
24
Hist. Avg.
40°
12°
25
Hist. Avg.
40°
12°
26
Hist. Avg.
40°
12°
27
Hist. Avg.
40°
12°
28
Hist. Avg.
40°
12°
29
Hist. Avg.
40°
12°
30
Hist. Avg.
41°
12°
31
Hist. Avg.
41°
12°
1
Hist. Avg.
41°
13°
2
Hist. Avg.
41°
13°
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 45° to 52°, with overnight lows between 12° and 25°. The average high for December is 48° with an average low of 21°. 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.
