September weather forecastPerth, Australia
September
Weather in September
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.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Perth, Australia
- Average high temperature in September: 20.4°C
The warmest month (with the highest average high temperature) is February (31.7°C).
The month with the lowest average high temperature is July (18.4°C).
- Average low temperature in September: 9.6°C
The month with the highest average low temperature is February (18.4°C).
The coldest month (with the lowest average low temperature) is July (7.7°C).
Average humidity in September
Perth, Australia
- Average humidity in September: 53%
The month with the highest relative humidity is July (57%).
The month with the lowest relative humidity is February (38%).
Average rainfall in September
Perth, Australia
- Average rainfall in September: 88mm
The wettest month (with the highest rainfall) is July (144.7mm).
The driest month (with the least rainfall) is February (8.8mm).
Average rainfall days in September
Perth, Australia
- Average rainfall days in September: 15.3 days
The month with the highest number of rainy days is July (16.9 days).
The month with the least rainy days is February (2.1 days).
Average sea temperature in September
Perth, Australia
- Average sea temperature in September: 19°C
The best month for swimming (with the highest average sea temperature) is March (23.4°C).
The coldest months (with the lowest average sea temperature) are September and October (19°C).
Average daylight in September /
Average sunshine in September
Perth, Australia
- Average daylight in September: 11h and 54min
The month with the longest days is December (Average daylight: 14h and 12min).
The month with the shortest days is June (Average daylight: 10h and 6min).
- Average sunshine in September: 7h and 42min
The months with the most sunshine are January and December (Average sunshine: 11h and 30min).
The month with the least sunshine is June (Average sunshine: 5h and 54min).
Average UV index in September
Perth, Australia
- Average UV index in September: 6
The months with the highest UV index are January and December (UV index 12).
The months with the lowest UV index are June and July (UV index 3).
