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Perth in September: Weather, Average temperature and Climate

Planning a trip and want to know what the weather in Perth in September will be like? Take a look at our weather guide for Perth, based on historical data.
Check flight prices to Perth on Avionero:
September

Weather in Perth in September 2025

Good Weather
Mild
🌧️
Rainy
🌊
Fresh water
Planning a trip to Perth in September? You are in luck! The weather is generally good, with an average maximum temperature of +19°C and approximately 9 sunny days. Just be prepared for some rain, as there are usually around 14 rainy days and 63 mm of precipitation. Expect good weather and pack accordingly to enjoy the outdoors. Search flights in one click on Avionero.

Average weather

☀️
+19°C
Avg. max. temperature
+2°C
Min.
+34°C
Max.
63 mm
Total precipitation
71%
Avg. humidity
4 m/s
Avg. wind
9 ☀️
Sunny Days
7 ⛅️
Cloudy
14 🌦
Rainy
Our opinion: Perth has good weather in September.

Average temperature in Perth in September

Here are the expected maximum, average and minimum temperatures in Perth for September based on the historical data.
Last Year
Historical Data

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:

The warmest water temperatures in Perth are reached in March, when the average sea temperature rises to +23°C. The coldest water temperatures are in September, with an average of +19°C.

Can you swim in Perth in September?

Water temperature (+19°C) in Perth in September might be suited for short swims and acclimatized swimmers might find it refreshing.
🦭
Cold
Below +16°C
🏄‍♂️
Fresh
16°C - 21°C
🏊
Comfortable
21°C - 25°C
👙
Warm
25°C - 28°C
🔥
Very warm
+28°C and up
Think of bringing a full-body or shorty wetsuit (3mm-5mm thickness) to provide insulation and maintain body heat.

Climate in Perth in September

Perth weather looks like this, on average, in September and the surrounding months.
AugustSeptemberOctober
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 mm63 mm32 mm
Wind
4 m/s4 m/s4 m/s
Avg. water temperature
+19°C+19°C+19°C
Humidity
74%71%65%
Air pressure
1018 HPa1017 HPa1016 HPa
Sunny days
9912
Cloudy days
679
Rainy days
16149
Snowy days
000

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

Wind speed in Perth in September based on historical data.
Last Year
Historical Data

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

Amount of rainfall in mm during September in Perth based on historical data.
Last Year
Historical Data
Typically, there is a 37% chance of rain on an average day in September, with total rainfall of approximately 79 mm. The maximum amount of rainfall per day is around 36 mm, which is moderate rain. September is a pretty wet month with over 11 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of galoshes.
Here’s how September is compared with other months in the amount of precipitation, total mm:
Perth wettest month is July, where a typical day has a 55% chance of precipitation and 121 mm of rainfall per day. December, on the other hand, is the driest month with a mere 13% chance of precipitation and 10 mm of rainfall per day.

How was the weather last September in Perth?

This is the weather in Perth in September 2023:
1 September
☁️
+24°C
2 September
🌧️
+19°C
3 September
☁️
+16°C
4 September
🌧️
+19°C
5 September
🌧️
+20°C
6 September
☀️
+18°C
7 September
☀️
+19°C
8 September
☀️
+25°C
9 September
☁️
+22°C
10 September
☁️
+22°C
11 September
☀️
+24°C
12 September
☁️
+25°C
13 September
🌧️
+18°C
14 September
☁️
+20°C
15 September
☁️
+21°C
16 September
☁️
+23°C
17 September
☀️
+20°C
18 September
☁️
+19°C
19 September
☁️
+20°C
20 September
☀️
+22°C
21 September
☀️
+25°C
22 September
☀️
+29°C
23 September
☀️
+20°C
24 September
☀️
+23°C
25 September
☀️
+22°C
26 September
☀️
+26°C
27 September
☀️
+34°C
28 September
☀️
+30°C
29 September
☁️
+23°C
30 September
☁️
+22°C
In September 2023 Perth had 14 sunny days, 12 cloudy days, and 4 rainy days. The average maximum temperature was +22°C, with an absolute maximum of +34°C and a minimum of +16°C. The average humidity was 76%, with a maximum of 100% and a minimum of 34%. The average wind speed was 5 m/s, with a maximum of 13 m/s and a minimum of 0 m/s.
Are you planning a trip in September?

Climate Change over Years

This is how Perth climate have been changing during last 43 years period.

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

Frequently asked questions about the weather in Perth in September:

Is September a good time to visit Perth?

September is a really good time to go to Perth. The weather is nice so plan your packing around outdoor activities and exploring. Check out other good time to visit Perth.

Can you sunbathe in Perth in September?

September has mild temperatures in Perth. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!

Can you swim in Perth in September?

In general, you can swim in Perth in September, if you want to, at an average water temperature of +19°C. But it will feel quite cool, and some precautions are necessary to ensure your comfort and safety.

Is Perth rainy in September?

Perth is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.

Is it sunny in Perth in September?

Usually, it’s not very sunny in Perth in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.

Other cities in Australia

Check out the weather for 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.