Sydney
Australia
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Sydney, Australia

The landmarks of the city of Sydney, Australia viewed from above the vast Parramatta River
The landmarks of the city of Sydney, Australia viewed from above the vast Parramatta River
September, the first month of the spring, in Sydney, is a pleasant month, with average temperature fluctuating between 20°C (68°F) and 11.1°C (52°F).

Temperature

In Sydney, Australia, the average high-temperature in September is relatively the same as in August - an agreeable 20°C (68°F). In Sydney, Australia, the average low-temperature is 11.1°C (52°F).

Humidity

In September, the average relative humidity in Sydney is 51%.

Rainfall

The month with the least rainfall in Sydney, Australia, is September when the rain falls for 10.5 days and typically collects 68.3mm (2.7") of precipitation.

Sea temperature

The month with the coldest seawater is September, with an average sea temperature of 18.6°C (65.5°F). Swimming in 18.6°C (65.5°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

Daylight

In Sydney, the average length of the day in September is 11.9h.

Sunshine

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

UV index

In September, the average daily maximum UV index in Sydney is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to the UV radiation for average individuals.
In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Sydney?

In September, in Sydney, Australia, the average high-temperature is 20°C (68°F), and the average low-temperature is 11.1°C (52°F).

What is the average humidity in September in Sydney?

In September, the average relative humidity in Sydney is 51%.

How many days does it rain in September in Sydney?

In Sydney, Australia, in September, during 10.5 rainfall days, 68.3mm (2.7") of precipitation is typically accumulated.

What is the driest month in Sydney?

The month with the least rainfall in Sydney is September when the rain falls for 10.5 days and typically collects 68.3mm (2.7") of precipitation.

What month is the sea coldest in Sydney?

September is the month with the coldest seawater in Sydney, Australia, with an average sea temperature of 18.6°C (65.5°F). For most, swimming in 18.6°C (65.5°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).

What is the sea water temperature in September in Sydney?

In Sydney, the average seawater temperature in September is 18.6°C (65.5°F). For swimming, a surface water temperature of 18.6°C (65.5°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

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

In September, the average length of the day in Sydney, Australia, is 11.9h.

What are the months with the most sunshine in Sydney?

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

How long on average sun shines in September in Sydney?

In Sydney, Australia, the average sunshine in September is 7.9h.

How high is the UV index in September in Sydney?

In September, the average daily maximum UV index in Sydney is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV radiation.
Average temperature in September - Sydney, Australia
  • Average high temperature in September: 20°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 September: 11.1°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).

Average humidity in September - Sydney, Australia
  • Average humidity in September: 51%

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

Average rainfall in September - Sydney, Australia
  • Average rainfall in September: 68.3mm

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

Average rainfall days in September - Sydney, Australia
  • Average rainfall days in September: 10.5 days

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

Average sea temperature in September - Sydney, Australia
  • Average sea temperature in September: 18.6°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).

Average daylight in September / Average sunshine in September - Sydney, Australia
  • Average daylight in September: 11.9h

The month with the longest days is December (Average daylight: 14.4h).
The month with shortest days is June (Average daylight: 9.9h).

  • Average sunshine in September: 7.9h

Months with most sunshine are August, September, October and December (Average sunshine: 7.9h).
The month with least sunshine is June (Average sunshine: 5.9h).

Average UV index in September - Sydney, Australia
  • Average UV index in September: 5

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).