Sydney weather in December
Temperature, sea and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Excellent
Best time to visit: July – May
What is the weather like in Sydney in December?
In December, Sydney is warm: daytime highs average 24 °C, and nights cool down to about 18 °C. The sea averages 21.6 °C – refreshing for a swim. The sun shines for around 8 hours a day. Rain falls on about 9 days, adding up to 54 mm. All in all, December is an excellent month for a holiday in Sydney.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 84 | 85 | 82 |
| Day | 22° | 24° | 25° |
| Night | 16° | 18° | 20° |
| Sea | 20° | 22° | 23° |
| Sun | 8 h | 8 h | 8 h |
| Rain days | 9 | 9 | 10 |
More details for December
- Daylight
- 14 h 23 min05:39 – 20:02
- UV index
- 11 · extremeclear sky, noon (estimate)All months
- Muggy days
- 7 daysdew point 18 °C or more
- Wind
- 19 km/haverage daily peak
- Cloud cover
- 55 %on average
- Hot days
- 2 days30 °C or more
- Time zone
- UTC+11Australia/Sydney
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %77 %
- Few rainy daysweight 30 %66 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in December
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Rain jacket or umbrella
Sydney in December: quick answers
Is Sydney hot in December?
Warm rather than hot: in December, daytime highs in Sydney average 24 °C and nights cool to about 18 °C. On about 2 days the thermometer climbs to 30 °C or more.
Can you swim in Sydney in December?
Yes. In December the sea averages 21.6 °C – refreshing for a swim.
Does it rain much in Sydney in December?
Rain falls on about 9 days, adding up to 54 mm.
Sydney month by month
The whole year in SydneyAll destinations: AustraliaWhere to go in DecemberSea temperature in December
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)