S
M
T
W
T
F
S
29
74°
67°
30
76°
67°
1
74°
68°
2
77°
68°
3
77°
67°
4
78°
68°
5
80°
69°
6
74°
68°
7
75°
69°
8
81°
69°
9
82°
68°
10
78°
68°
11
81°
67°
12
83°
65°
13
76°
65°
14
80°
62°
15
83°
62°
16
76°
66°
17
76°
68°
18
77°
68°
19
81°
70°
20
83°
69°
21
83°
66°
22
76°
63°
23
76°
65°
24
77°
62°
25
76°
60°
26
77°
67°
27
77°
69°
28
83°
70°
29
84°
71°
30
86°
68°
31
84°
65°
1
77°
62°
2
77°
64°
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 74° to 86°, with overnight lows between 60° and 71°. The average high for December is 79° with an average low of 67°. 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.
