Is Sydney hot in December?
Days are typically warm at 25.7°C, while nights average 18.4°C.
Australia · 1991–2020 normal
Sydney in
December.
Typical December weather in Sydney: 25.7°C by day, 18.4°C at night, 73 mm of rain over 7.9 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high25.7°C
Typical low18.4°C
Rain73 mm
Wet days7.9
In the year-round weather comparison, December scores 78 out of 100 (October leads the year at 88). Daylight is calculated as 14 h 24 from latitude -33.87°. Open-water sea temperature is 21.4°C (16 km from the place centre).
December at a glance
What is Sydney like in December?
Plain answers from the measured climate record—not a forecast or a promise about a particular trip.
Does it rain much?
The measured monthly average is 73 mm across about 8 wet days.
How much daylight is there?
There are about 14 h 24 between sunrise and sunset at mid-month, calculated from the place latitude.
Is December a good time to visit?
December ranks 5 of 12 in our weather comparison; October ranks first.
Event window
Warm sea in December
The nearest open-water NOAA OISST 1991–2020 cell averages 21.4°C in December. A sheltered bay can run warmer than that open-water cell.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 2147714
- NOAA station
- ASN00066062 · SYDNEY (OBSERVATORY HILL)
- Station distance
- 0.8 km from the place centre
- Coverage
- Strong coverage · 29 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.
Next step
Choose your month.
Then plan the details.
The weather comparison for Sydney is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
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