September weather forecast and climate
Sydney, Australia

The landmarks of the city of Sydney, Australia
The landmarks of the city of Sydney, Australia
The first month of the spring, September, is an agreeable month in Sydney, Australia, with average temperature varying between 11.1°C (52°F) and 20°C (68°F).

Temperature

In September, the average high-temperature is almost the same as in August - an agreeable 20°C (68°F). In Sydney, Australia, in September, 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. Rain falls for 10.5 days and accumulates 68.3mm (2.69") of precipitation.

Sea temperature

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

Daylight

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.

UV index

In Sydney, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
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. 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.

What is the temperature in September in Sydney?

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

What is the average humidity in September in Sydney?

The average relative humidity in September in Sydney is 51%.

How many days does it rain in September in Sydney?

In Sydney, in September, it is raining for 10.5 days, with typically 68.3mm (2.69") of accumulated precipitation.

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 (2.69") of precipitation.

When is the sea coldest in Sydney?

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

How cold is the water in September in Sydney?

In Sydney, the average seawater temperature in September is 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).

How many hours of daylight does Sydney have in September?

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

What is the month 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?

The average sunshine in September is 7.9h.

What is the UV index intensity in September in Sydney?

The average daily maximum UV index in September in Sydney, Australia, is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from unsafe exposure to the Sun's UV rays.
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 least 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 least 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 the shortest days is June (Average daylight: 9.9h).

  • Average sunshine in September: 7.9h

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