September weather forecast
Sydney, Australia

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

Weather in September

The first month of the spring, September, is a pleasant month in Sydney, Australia, with an average temperature ranging between max 20°C (68°F) and min 11.1°C (52°F).

Temperature

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

Humidity

In September, the average relative humidity is 51%.

Rainfall

September is the month with the least rainfall in Sydney. Rain falls for 10.5 days and accumulates 68mm (2.68") of precipitation.

Sea temperature

September is the month with the coldest seawater in Sydney, with an average sea temperature of 18.6°C (65.5°F).
Note: 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 11h and 53min.
On the first day of September, sunrise is at 6:13 am and sunset at 5:36 pm. On the last day of the month, sunrise is at 5:33 am and sunset at 5:56 pm AEST.

Sunshine

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

UV index

The average daily maximum UV index in September in Sydney is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Sydney?

In Sydney, in September, 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%.

What is the driest month in Sydney?

The month with the least rainfall in Sydney, Australia, is September, when the rain falls for 10.5 days and typically collects 68mm (2.68") of precipitation.

How many days does it rain in September in Sydney?

In September, the rain falls for 10.5 days. Throughout September, 68mm (2.68") of precipitation is accumulated.

When is the sea coldest in Sydney?

The month with the coldest seawater is September, with an average sea temperature of 18.6°C (65.5°F).

What is the sea water temperature in September in Sydney?

In Sydney, Australia, 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 Sydney, the average day length in September is 11h and 53min.

When are sunrise and sunset in September in Sydney?

On the first day of September, sunrise is at 6:13 am and sunset at 5:36 pm. On the last day of the month, sunrise is at 5:33 am and sunset at 5:56 pm AEST.

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 many hours of sunshine does Sydney have in September?

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

What is the UV index reading in September in Sydney?

In Sydney, Australia, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average sunshine
Average UV index

Average temperature in September
Sydney, Australia

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).

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Average humidity in September
Sydney, Australia

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%).

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Average rainfall in September
Sydney, Australia

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 least rainfall) is September (68.3mm).

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Average rainfall days in September
Sydney, Australia

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 least rainy days is August (10.4 days).

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Average sea temperature in September
Sydney, Australia

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).

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

Average daylight in September / Average sunshine in September - Sydney, Australia
  • Average daylight in September: 11h and 53min

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 September: 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 September
Sydney, Australia

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

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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