Perth Weather in September

September in Perth brings pleasant temperatures, with highs of 20°C (68°F) and nights dropping to 10°C (50°F). Rainfall is on the higher side this month, averaging around 63 mm (2.5 in), so keep a rain jacket handy.

Rainfall in Perth in September

Climate statistics over the past 30 years suggest around 10 days of rain, with 63 mm (2.5 in) average for the month. Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.

Temperature in Perth in September

If you're visiting Perth in September, expect perfect temperatures with highs of 20°C (68°F) and overnight lows of 10°C (50°F). The difference between afternoon and evening temperatures is usually noticeable. Nights fall to 10°C (50°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.

Sunshine in Perth in September

Expect sunny days throughout the month, with an estimated 230 hours of sunshine. This makes it a pleasant time to visit Perth.

Wind Speed in Perth in September

Average wind conditions reach 6 m/s (12 knots) in September. This creates notably windy weather that is clearly felt and can influence daily activities. Keep in mind this is an average. Some days are less intense, while others can be quite gusty.

Average water temperature in September

The water is 17°C (63°F) this month — cool enough to feel refreshing on a warm day, but cold enough that most people won't stay in for long without a wetsuit.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. April, May, September, October and November typically offer the best weather for Perth.

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• January
• February
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• May
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• October
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• December

For a detailed overview over the year and the best time to visit Australia, check out our Perth's climate page.

Perth Temperature in September

Min Temperature 10°C (50°F)  

Max Temperature 20°C (68°F)  

Water Temperature 17°C (63°F)  

Chance of Rain 35%  

Precipitation 63 mm (2.5 in)  

Rainy days 10 days  

Humidity 53%  

Windspeed 6 m/s (12 knots)  

Sunshine 230 hours  

Percentage Sunshine  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Perth typically stay consistent throughout September, with daily highs averaging around 20°C (68°F). Nights are cool, with lows around 9°C (48°F).

Average temperatures in September

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

‹ January February March April May June July August September October November December ›

Historical weather for Perth in September

Browse day-by-day weather records for Perth spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Perth historical weather extremes in September

According to our 49 years of weather records for Perth, the following extremes were recorded between 1976 and 2025.

• The warmest day in September was on September 27, 2023, with a maximum of 34°C (93°F).
• On September 23, 2003, Perth saw its coldest September day with temperatures maxing out at 13°C (55°F).
• Nighttime temperatures dropped to 1°C (34°F) on September 16, 2002, marking the coldest September night on record.

What to Wear in Perth in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. Expect water temperatures of around 17°C (63°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Perth in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling

10/10

Walking

10/10

Barbeque

8/10

Camping

4/10

Outdoor sports

10/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Australia, check out our Perth's climate page.

More climate data for Perth

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Perth climate overview or explore weather in Australia.