Weather in Perth in September 2025
Average weather
Average temperature in Perth in September
Going from a maximum of +34°C during the day to a minimum of +7°C during the night, the temperature in September averages around +22°C.
The average maximum temperature goes down 7% by the end of the month, compared with the beginning of the month, from +24°C to +22°C.
Is Perth warm or cold in September?
Perth is typically mild in September.
Maximum temperatures go up compared to the previous month from +18°C to +19°C. The minimum temperature also goes up from +9°C to +11°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Perth:
Water temperature in Perth in September
Water in Perth in September is Fresh. It varies from +18°C to +20°C, with an average of +19°C. This is almost similar to the air temperature, which averages +19°C.
The water temperature in September is one of the coldest of the entire year:
Can you swim in Perth in September?
Climate in Perth in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +18°C | +19°C | +22°C | ||||
| Min. temperature | ||||||
| +1°C | +2°C | +3°C | ||||
| Max. temperature | ||||||
| +29°C | +34°C | +36°C | ||||
| Rainfall | ||||||
| 103 mm | 63 mm | 32 mm | ||||
| Wind | ||||||
| 4 m/s | 4 m/s | 4 m/s | ||||
| Avg. water temperature | ||||||
| +19°C | +19°C | +19°C | ||||
| Humidity | ||||||
| 74% | 71% | 65% | ||||
| Air pressure | ||||||
| 1018 HPa | 1017 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 9 | 9 | 12 | ||||
| Cloudy days | ||||||
| 6 | 7 | 9 | ||||
| Rainy days | ||||||
| 16 | 14 | 9 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as good as in August. It’s getting warmer as September arrives. The average maximum temperature goes up from +18°C to +19°C during the day. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 103 mm to 63 mm. It feels drier, as humidity decreases from 74% to 71%. The average wind speed doesn’t change much during September, staying around 4 m/s. The amount of sunny days stay about the same, averaging 9 sunny days during the month.
October brings much the same weather, it remains good.
Wind
The average wind speed is 5 m/s getting up to 8 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Perth is gradually decreasing during September, going from 5 m/s to 4 m/s over the course of the month.
Rain
How was the weather last September in Perth?
Climate Change over Years
The climate in Perth in September has not changed much over the last 43 years.
The average temperature was the lowest in 1990 (+22°C) and the highest in 2023 (+25°C). The driest year was 2010 with only 285 mm of rainfall, and the wettest year was 2012 with 1017 mm.
FAQ
Is September a good time to visit Perth?
Can you sunbathe in Perth in September?
Can you swim in Perth in September?
Is Perth rainy in September?
Is it sunny in Perth in September?
Other cities in Australia
Monthly weather in Perth
Source of the data
For this page, we’ve looked at the typical weather in Perth, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.