September weather forecast and climate
Cottesloe, Australia

The first month of the spring, September, is also an enjoyable month in Cottesloe, Australia, with average temperature varying between 12.3°C (54.1°F) and 18.3°C (64.9°F).

Temperature

In Cottesloe, the average high-temperature is almost the same as in August - a still enjoyable 18.3°C (64.9°F). The average low-temperature, in Cottesloe, is 12.3°C (54.1°F).

Humidity

The average relative humidity in Cottesloe, Australia, is 70%.

Rainfall

In September, in Cottesloe, the rain falls for 12.9 days. Throughout September, 36mm (1.42") of precipitation is accumulated. In Cottesloe, during the entire year, the rain falls for 114 days and collects up to 404mm (15.91") of precipitation.

Sea temperature

September is the month with the coldest seawater, with an average sea temperature of 18.7°C (65.7°F).
Note: Swimming in 18.7°C (65.7°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 Cottesloe, Australia, the average length of the day is 11.9h.

Sunshine

The average sunshine in Cottesloe, Australia, is 8.2h.

UV index

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to the UV radiation for the ordinary person.
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 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.

What is the temperature in September in Cottesloe?

In Cottesloe, in September, the average high-temperature is 18.3°C (64.9°F), and the average low-temperature is 12.3°C (54.1°F).

What is the average humidity in September in Cottesloe?

The average relative humidity in September in Cottesloe, Australia, is 70%.

How many days does it rain in September in Cottesloe?

In September, in Cottesloe, the rain falls for 12.9 days. Throughout September, 36mm (1.42") of precipitation is accumulated.

What month is the sea coldest in Cottesloe?

The month with the coldest seawater in Cottesloe, Australia, is September, with an average sea temperature of 18.7°C (65.7°F).

What is the sea temperature in September in Cottesloe?

In Cottesloe, the average seawater temperature in September is 18.7°C (65.7°F). Swimming in 18.7°C (65.7°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

How many hours of daylight does Cottesloe have in September?

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

How many hours of sunshine does Cottesloe have in September?

In Cottesloe, Australia, the average sunshine in September is 8.2h.

What is the UV index intensity in September in Cottesloe?

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV radiation.
Average temperature in September - Cottesloe, Australia
  • Average high temperature in September: 18.3°C

The warmest month (with the highest average high temperature) is February (27.7°C).
The month with the lowest average high temperature is July (17.2°C).

  • Average low temperature in September: 12.3°C

The month with the highest average low temperature is February (19.8°C).
The coldest months (with the lowest average low temperature) are July and August (12.2°C).

Average pressure in September - Cottesloe, Australia
  • Average pressure in September: 1019mbar

The month with the highest atmospheric pressure is July (1020.5mbar).
The month with the lowest atmospheric pressure is January (1011.5mbar).

Average wind speed in September - Cottesloe, Australia
  • Average wind speed in September: 17.9km/h

The windiest month (with the highest average wind speed) is January (19.7km/h).
The calmest month (with the lowest average wind speed) is April (16.2km/h).

Average humidity in September - Cottesloe, Australia
  • Average humidity in September: 70%

The month with the highest relative humidity is August (72%).
Months with the lowest relative humidity are January, February and December (59%).

Average rainfall in September - Cottesloe, Australia
  • Average rainfall in September: 36mm

The wettest month (with the highest rainfall) is June (75mm).
The driest month (with the least rainfall) is March (11mm).

Average rainfall days in September - Cottesloe, Australia
  • Average rainfall days in September: 12.9 days

The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is February (4.3 days).

Average sea temperature in September - Cottesloe, Australia
  • Average sea temperature in September: 18.7°C

The best month for swimming (with the highest average sea temperature) is March (23.3°C).
The coldest month (with the lowest average sea temperature) is September (18.7°C).

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

The month with the longest days is December (Average daylight: 14.2h).
The month with the shortest days is June (Average daylight: 10.1h).

  • Average sunshine in September: 8.2h

Months with the most sunshine are January and December (Average sunshine: 11.6h).
The month with the least sunshine is August (Average sunshine: 5.7h).

Average sunshine days in September - Cottesloe, Australia
  • Average sunshine days in September: 14.8 days

The month with the most sunshine days is December (24.2 days).
The month with the least sunshine days is July (12.8 days).

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

Months with the highest UV index are January, February, March and December (UV index 6).
Months with the lowest UV index are June, July and August (UV index 4).

Average visibility in September - Cottesloe, Australia
  • Average visibility in September: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).