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