Sydney Weather in December

December in Sydney sees daytime temperatures around 24°C (75°F) and lows of 18°C (64°F) at night. With around 63 mm (2.5 in) of rainfall expected, it's worth packing a rain jacket.

Rainfall in Sydney in December

Past climate data indicates that roughly 10 days will see rain, totalling around 63 mm (2.5 in) for the month. Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.

Temperature in Sydney in December

Weather in Sydney is at its excellent in December. Highs reach 24°C (75°F), while nights settle around 18°C (64°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With overnight lows of 18°C (64°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Sydney in December

The days are predominantly sunny, with an estimated total of around 257 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.

Wind Speed in Sydney in December

Wind speeds average 4 m/s (8 knots) during December. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.

Average water temperature in December

With water at 20°C (68°F), conditions are good for swimming and other water activities. You won't need a wetsuit and most people find it very comfortable.

If your ideal day consists of dry skies and pleasant temperatures, January, March, April, May, September, October, November and December typically offer the best circumstances for Sydney.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Australia, check out our Sydney's climate page.

Sydney Temperature in December

Min Temperature 18°C (64°F)  

Max Temperature 24°C (75°F)  

Water Temperature 20°C (68°F)  

Chance of Rain 34%  

Precipitation 63 mm (2.5 in)  

Rainy days 10 days  

Humidity 58%  

Windspeed 4 m/s (8 knots)  

Sunshine 257 hours  

Percentage Sunshine 55%  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Sydney typically stay consistent throughout December, with daily highs averaging around 24°C (75°F). Nights are pleasant, with lows typically ranging from 17°C (63°F) to 19°C (66°F).

Average temperatures in December

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in December

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

‹ January February March April May June July August September October November December ›

Historical weather for Sydney in December

Browse day-by-day weather records for Sydney spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Sydney historical weather extremes in December

Our historical data for Sydney spans 1976 to 2025, revealing these weather extremes.

• The warmest day in December was on December 25, 1984, with a maximum of 40°C (104°F).
• The lowest daytime temperature in December was 17°C (63°F), recorded on December 12, 1995.
• The coldest night in December in Sydney was on December 5, 1984, with a minimum of 9°C (48°F).

What to Wear in Sydney in December

Comfortable temperatures call for an easy wardrobe in December. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days. With water temperatures around 20°C (68°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Sydney in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

10/10

Walking

10/10

Barbeque

8/10

Camping

8/10

Outdoor sports

10/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Australia, check out our Sydney's climate page.

More climate data for Sydney

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Sydney climate overview or explore weather in Australia.