December weather forecast
Sydney, Australia

The landmarks of the city of Sydney, Australia
The landmarks of the city of Sydney, Australia

Weather in December

December, the first month of the summer in Sydney, is still a warm month, with an average temperature ranging between max 25.2°C (77.4°F) and min 17.5°C (63.5°F).

Temperature

In December, the average high-temperature is essentially the same as in November - a still warm 25.2°C (77.4°F). In December, in Sydney, the average low-temperature is 17.5°C (63.5°F).

Humidity

In December, the average relative humidity in Sydney is 59%.

Rainfall

In Sydney, during December, the rain falls for 11.5 days and regularly aggregates up to 78mm (3.07") of precipitation. In Sydney, during the entire year, the rain falls for 143.4 days and collects up to 1212mm (47.72") of precipitation.

Sea temperature

In Sydney, the average seawater temperature in December is 21.9°C (71.4°F).
Note: For most, swimming in 21.9°C (71.4°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

Daylight

December has the longest days of the year, with an average of 14h and 22min of daylight.
On the first day of December, sunrise is at 5:37 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 5:46 am and sunset at 8:09 pm AEDT.

Sunshine

The months with the most sunshine are August through October and December, with an average of 7.9h of sunshine.

UV index

January and December, with an average maximum UV index of 12, are months with the highest UV index in Sydney. A UV Index value of 11, and more, symbolizes an excessive health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 12 in December interpret into the following advice:
Practice all essential precautions. Protection against sun damage is crucial. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Prolonged stay under the direct sun should be avoided as much as possible, especially if a person burns easily. Sunscreen with a minimum 30 sun protection factor should always be used. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the temperature in December in Sydney?

The average high-temperature, in December, is 25.2°C (77.4°F), while the average low-temperature is 17.5°C (63.5°F).

What is the average humidity in December in Sydney?

The average relative humidity in December in Sydney, Australia, is 59%.

How much does it rain in Sydney in December?

In Sydney, Australia, in December, it is raining for 11.5 days, with typically 78mm (3.07") of accumulated precipitation.

What is the sea temperature in December in Sydney?

In December, the average sea temperature in Sydney is 21.9°C (71.4°F). For most, swimming in 21.9°C (71.4°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

When are the longest days in Sydney?

The month with the longest days in Sydney is December, with an average of 14h and 22min of daylight.

What is the average length of the day in December in Sydney?

In Sydney, Australia, the average day length in December is 14h and 22min.

What time are sunrise and sunset in December in Sydney?

On the first day of December, sunrise is at 5:37 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 5:46 am and sunset at 8:09 pm AEDT.

What is the month with the most sunshine in Sydney?

The months with the most sunshine are August through October and December, with an average of 7.9h of sunshine.

How long on average sun shines in December in Sydney?

In December, the average sunshine duration in Sydney is 7.9h.

What are the months with the highest UV index in Sydney?

The months with the highest UV index in Sydney, Australia, are January and December, with an average maximum UV index of 12.

How high is the UV index in December in Sydney?

In Sydney, Australia, the average daily maximum UV index in December is 12. A UV Index reading of 11, and higher, represents an excessive health risk from unsafe exposure to Sun's UV rays.

Average temperature in December
Sydney, Australia

Average temperature in December - Sydney, Australia
  • Average high temperature in December: 25.2°C

The warmest month (with the highest average high temperature) is January (25.9°C).
The month with the lowest average high temperature is July (16.3°C).

  • Average low temperature in December: 17.5°C

The month with the highest average low temperature is February (18.8°C).
The coldest month (with the lowest average low temperature) is July (8.1°C).

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Average humidity in December
Sydney, Australia

Average humidity in December - Sydney, Australia
  • Average humidity in December: 59%

The month with the highest relative humidity is February (64%).
The month with the lowest relative humidity is August (49%).

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Average rainfall in December
Sydney, Australia

Average rainfall in December - Sydney, Australia
  • Average rainfall in December: 77.6mm

The wettest month (with the highest rainfall) is June (131.9mm).
The driest month (with the least rainfall) is September (68.3mm).

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Average rainfall days in December
Sydney, Australia

Average rainfall days in December - Sydney, Australia
  • Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is March (13.6 days).
The month with the least rainy days is August (10.4 days).

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Average sea temperature in December
Sydney, Australia

Average sea temperature in December - Sydney, Australia
  • Average sea temperature in December: 21.9°C

The best month for swimming (with the highest average sea temperature) is February (23.7°C).
The coldest month (with the lowest average sea temperature) is September (18.6°C).

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Average daylight in December /
Average sunshine in December
Sydney, Australia

Average daylight in December / Average sunshine in December - Sydney, Australia
  • Average daylight in December: 14h and 22min

The month with the longest days is December (Average daylight: 14h and 22min).
The month with the shortest days is June (Average daylight: 9h and 56min).

  • Average sunshine in December: 7h and 54min

The months with the most sunshine are August, September, October and December (Average sunshine: 7h and 54min).
The month with the least sunshine is June (Average sunshine: 5h and 54min).

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Average UV index in December
Sydney, Australia

Average UV index in December - Sydney, Australia
  • Average UV index in December: 12

The months with the highest UV index are January and December (UV index 12).
The month with the lowest UV index is June (UV index 2).

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