Fremantle Weather in September

With daytime temperatures of 20°C (68°F) and nighttime lows of 12°C (54°F), September in Fremantle brings pleasant temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 65 mm (2.6 in) falls on average.

Rainfall in Fremantle in September

You can expect rain on around 10 days based on historical patterns, with 65 mm (2.6 in) average for the month. Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.

Temperature in Fremantle in September

Weather in Fremantle is at its excellent in September. Highs reach 20°C (68°F), while nights settle around 12°C (54°F). This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. With overnight lows of 12°C (54°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Fremantle in September

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

Wind Speed in Fremantle 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.

If your ideal day consists of dry skies and pleasant temperatures, March, April, May, September, October, November and December typically offer the best circumstances for Fremantle.

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 Fremantle's climate page.

Fremantle Temperature in September

Min Temperature 12°C (54°F)  

Max Temperature 20°C (68°F)  

Water Temperature 17°C (63°F) *  

Chance of Rain 34%  

Precipitation 65 mm (2.6 in)  

Rainy days 10 days  

Humidity 53% *  

Windspeed 6 m/s (12 knots) *  

Sunshine 230 hours *  

Percentage Sunshine *  

* Data from: Perth, Australia (23 KM, 14 Miles).

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Fremantle typically stay consistent throughout September, with daily highs averaging around 20°C (68°F). Nights are cool, with lows around 10°C (50°F).

Average temperatures in September

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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 Fremantle in September

Browse day-by-day weather records for Fremantle 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 ›

Fremantle historical weather extremes in September

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

• On September 9, 2019, temperatures climbed to 31°C (88°F), marking the warmest September day on record.
• On September 22, 1998, Fremantle saw its coldest September day with temperatures maxing out at 13°C (55°F).
• The coldest night in September in Fremantle was on September 2, 2015, with a minimum of 1°C (34°F).

What to Wear in Fremantle 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 Fremantle in September

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

Cycling

10/10

Walking

10/10

Camping

8/10

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 Fremantle's climate page.

More climate data for Fremantle

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

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