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Sydney in December: Weather, Average temperature and Climate

Planning a trip and want to know what the weather in Sydney in December will be like? Take a look at our weather guide for Sydney, based on historical data.
Check flight prices to Sydney on Avionero:
December

Weather in Sydney in December 2024

Good Weather
Warm
🌧️
Rainy
🌊
Comfortable water
Planning a trip to Sydney in December? You are in luck! The weather is generally good, with an average maximum temperature of +25°C and approximately 7 sunny days. Just be prepared for some rain, as there are usually around 15 rainy days and 75 mm of precipitation. Expect good weather and pack accordingly to enjoy the outdoors. Search flights in one click on Avionero.

Average weather

☀️
+25°C
Avg. max. temperature
+11°C
Min.
+41°C
Max.
75 mm
Total precipitation
68%
Avg. humidity
4 m/s
Avg. wind
7 ☀️
Sunny Days
7 ⛅️
Cloudy
15 🌦
Rainy
Our opinion: Sydney has good weather in December.

Average temperature in Sydney in December

Here are the expected maximum, average and minimum temperatures in Sydney for December based on the historical data.
Last Year
Historical Data

Going from a maximum of +35°C during the day to a minimum of +16°C during the night, the temperature in December averages around +26°C.

The average maximum temperature goes down 16% by the end of the month, compared with the beginning of the month, from +24°C to +21°C.

Is Sydney warm or cold in December?

Sydney is typically warm in December.

Maximum temperatures go up compared to the previous month from +23°C to +25°C. The minimum temperature also goes up from +16°C to +18°C.

It’s generally warm, but pack a long-sleeve shirt for evenings.

December is one of the warmest months in Sydney, here is the comparison with other months:

Water temperature in Sydney in December

Water in Sydney in December is Comfortable. It varies from +20°C to +25°C, with an average of +22°C. This is almost similar to the air temperature, which averages +25°C.

In December, water temperatures are average relative to the rest of the year:

The warmest water temperatures in Sydney are reached in February, when the average sea temperature rises to +24°C. The coldest water temperatures are in September, with an average of +19°C.

Can you swim in Sydney in December?

The water in Sydney in December is pretty comfortable (+22°C in average). Ideal for swimming, especially in outdoor pools and open water. Suitable for recreational and casual swimmers.
🦭
Cold
Below +16°C
🏄‍♂️
Fresh
16°C - 21°C
🏊
Comfortable
21°C - 25°C
👙
Warm
25°C - 28°C
🔥
Very warm
+28°C and up
Don’t forget a large beach towel or two for drying off.

Climate in Sydney in December

Sydney weather looks like this, on average, in December and the surrounding months.
NovemberDecemberJanuary
Avg. temperature
+23°C+25°C+26°C
Min. temperature
+8°C+11°C+13°C
Max. temperature
+41°C+41°C+44°C
Rainfall
82 mm75 mm79 mm
Wind
4 m/s4 m/s4 m/s
Avg. water temperature
+21°C+22°C+23°C
Humidity
68%68%71%
Air pressure
1013 HPa1012 HPa1012 HPa
Sunny days
676
Cloudy days
677
Rainy days
151515
Snowy days
000

December weather is still as good as in November. It’s getting warmer as December arrives. The average maximum temperature goes up from +23°C to +25°C during the day. As December arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 82 mm to 75 mm. Humidity levels don’t change as the month goes on, averaging around 68%. The average wind speed doesn’t change much during December, staying around 4 m/s. The good news is there are likely to be more sunny days in December, from 6 to 7.

January brings much the same weather, it remains good.

Wind

Wind speed in Sydney in December based on historical data.
Last Year
Historical Data

The average wind speed is 5 m/s getting up to 9 m/s which is a medium breeze. You can feel it, especially getting out of the water.

The average wind speed in Sydney is gradually increasing during December, going from 4 m/s to 4 m/s over the course of the month.

Rain

Amount of rainfall in mm during December in Sydney based on historical data.
Last Year
Historical Data
Typically, there is a 65% chance of rain on an average day in December, with total rainfall of approximately 774 mm. The maximum amount of rainfall per day is around 222 mm, which is considered heavy rain. December is a pretty wet month with over 20 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of galoshes.
Here’s how December is compared with other months in the amount of precipitation, total mm:
Sydney wettest month is March, where a typical day has a 58% chance of precipitation and 106 mm of rainfall per day. September, on the other hand, is the driest month with a mere 37% chance of precipitation and 46 mm of rainfall per day.

How was the weather last December in Sydney?

This is the weather in Sydney in December 2023:
1 December
🌧️
+24°C
2 December
☁️
+23°C
3 December
🌧️
+25°C
4 December
🌧️
+25°C
5 December
☀️
+28°C
6 December
☁️
+25°C
7 December
☁️
+26°C
8 December
☀️
+32°C
9 December
☁️
+35°C
10 December
☁️
+25°C
11 December
☁️
+27°C
12 December
☁️
+28°C
13 December
☀️
+30°C
14 December
☀️
+35°C
15 December
☀️
+27°C
16 December
☀️
+31°C
17 December
☁️
+25°C
18 December
☁️
+28°C
19 December
🌧️
+31°C
20 December
🌧️
+18°C
21 December
☁️
+21°C
22 December
☁️
+23°C
23 December
☀️
+24°C
24 December
🌧️
+22°C
25 December
☁️
+26°C
26 December
☁️
+28°C
27 December
☀️
+25°C
28 December
☀️
+29°C
29 December
🌧️
+26°C
30 December
🌧️
+25°C
31 December
🌧️
+21°C
In December 2023 Sydney had 9 sunny days, 13 cloudy days, and 9 rainy days. The average maximum temperature was +26°C, with an absolute maximum of +35°C and a minimum of +18°C. The average humidity was 80%, with a maximum of 99% and a minimum of 46%. The average wind speed was 5 m/s, with a maximum of 16 m/s and a minimum of 0 m/s.
Are you planning a trip in December?

Climate Change over Years

This is how Sydney climate have been changing during last 43 years period.

The climate in Sydney in December has not changed much over the last 43 years.

The average temperature was the lowest in 1992 (+20°C) and the highest in 2019 (+23°C). The driest year was 2006 with only 423 mm of rainfall, and the wettest year was 2022 with 2786 mm.

FAQ

Frequently asked questions about the weather in Sydney in December:

Is December a good time to visit Sydney?

December is a really good time to go to Sydney. The weather is nice so plan your packing around outdoor activities and exploring. Check out other good time to visit Sydney.

Can you sunbathe in Sydney in December?

December is warm in Sydney. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.

Can you swim in Sydney in December?

Yes, the water temperature in Sydney in December is considered moderate and enjoyable for most people, averaging around +22°C.

Is Sydney rainy in December?

Sydney is often rainy in December. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.

Is it sunny in Sydney in December?

Usually, it’s not very sunny in Sydney in December, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.

Other cities in Australia

Check out the weather for other cities in Australia.

Monthly weather in Sydney

Source of the data

For this page, we’ve looked at the typical weather in Sydney, based on historical hourly weather data from January 1, 1979, to December 31, 2023.

For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.