September weather forecast
Perth, Australia

September marks the arrival of spring in Perth, bringing pleasant weather and blooming flowers. Gradual warming up of temperatures indicates the city’s shift from cooler to warmer months. Initially, remnants of winter rainfall linger, but as the month advances, the rain subsides. As September progresses, the city blankets itself in a myriad of colors, courtesy of the famous wildflower season. The rising temperatures and vibrant landscapes attract outdoorsy locals and visitors to the city's open spaces.

Temperature

The introduction of September sees an average high-temperature of a pleasant 20.4°C (68.7°F), hardly deviating from August. Perth's temperature drops to an average low of 9.6°C (49.3°F) during the nights of September.

Humidity

In September, the average relative humidity is 53%.

Rainfall

In September, in Perth, the rain falls for 15.3 days. Throughout September, 88mm (3.46") of precipitation is accumulated. In Perth, during the entire year, the rain falls for 108.4 days and collects up to 725mm (28.54") of precipitation.

Sea temperature

September and October, with an average sea temperature of 19°C (66.2°F), are months with the coldest seawater in Perth.
Note: The majority of people do not enjoy swimming in 19°C (66.2°F). The difficulty in controlling breathing escalates as the temperature descends from 21°C (69.8°F) to 15°C (59°F).

Daylight

The average length of the day in September is 11h and 54min.
On the first day of the month, sunrise is at 6:32 am and sunset at 6:00 pm. On the last day of September, sunrise is at 5:55 am and sunset at 6:17 pm AWST.

Sunshine

In Perth, the average sunshine in September is 7.7h.

UV index

In Perth, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 6 translates into the following recommendations:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.