Fremantle – current water temperature and swimming conditions

This page shows the current water temperature at Fremantle in Western Australia. You can view recent sea temperature trends on a 30-day chart, check typical monthly water temperature ranges, and compare today’s reading with historical averages for this date. The page also includes a 7-day water temperature forecast, nearby beaches with similar conditions, local weather information, and a summary of swimming conditions to help you assess how suitable the water is for swimming.

Current Sea Water Temperature

18.7°C

Today

19.0°C

Yesterday

18.9°C

A Week Ago

The average sea water temperature today in Fremantle is about 19°C.

Water Temperature in Fremantle: Daily Trends, Historical Records, and Forecast

⚠️ Water in this range feels cool but still manageable for many swimmers. Short to moderate swims are comfortable, especially in warm weather. Some people may prefer a wetsuit for longer stays, particularly when swimming actively or outside peak summer conditions.

It’s important to note that these swimming tips and recommendations apply only in settled weather. When air temperatures drop below 20°C — and sometimes even below 25°C — swimming can feel uncomfortable, even when water temperatures are relatively high.

Water Temperature Over the Last 30 Days

From September 15 to October 15

Over the past 30 days, water temperatures in Fremantle have generally increased, although a slight cooling trend has set in over the last week.

According to our forecast, Sea water temperature in Fremantle will be 18.9°C in the next 7 days. See the table below for daily data for the upcoming week.

Table of Daily Sea Temperature Data

Date	Current	Average	Forecast
Oct 7	18.8°C	18.8°C
Oct 8	18.9°C	19.3°C
Oct 9	18.9°C	18.8°C
Oct 10	19.1°C	18.5°C
Oct 11	19.1°C	18.5°C
Oct 12	19.0°C	19.3°C
Oct 13	19.1°C	19.3°C
Oct 14	19.0°C	19.3°C
Oct 15	18.7°C	19.3°C	18.7°C
Oct 16		18.8°C	18.7°C
Oct 17		18.5°C	18.8°C
Oct 18		18.5°C	18.8°C
Oct 19		18.5°C	18.8°C
Oct 20		19.3°C	18.9°C
Oct 21		19.0°C	18.9°C
Oct 22		19.3°C	18.9°C

* Current - Actual water temperature value

** Average - Average water temperature on this day in recent years

*** Forecast - Our water temperature forecast

Actual near-shore water temperatures in Fremantle can vary by several degrees from the values shown, particularly after heavy rain, strong southerlies, or prolonged windy conditions. Certain wind patterns can trigger upwelling, where cooler, deeper water is pushed to the surface and replaces the warmer top layer, leading to noticeable short-term changes in water temperature.

Our water temperature forecast is produced using a proprietary mathematical model that combines real-time measurements with long-term historical patterns, local weather conditions, wind strength and direction, and air temperature specific to each coastal region. To improve accuracy, we cross-check data from nearby locations and use multiple sources, including offshore buoys, satellite-based sea surface maps, and observations provided by local authorities.

Annual Water Temperature Overview by Month

Monthly Water Temp Ranges

30°C

25°C

20°C

15°C

10°c

5°C

0°C

Annual Water Temperature Trend

Fremantle sits where the Swan River meets the Indian Ocean, giving it a mix of open coast and more sheltered swimming spots. Water temperatures here follow the typical Perth City Coast pattern and are comfortable for much of the year. In summer, from December to February, the sea usually ranges between 21–24°C, feeling warm and refreshing on hot days. Autumn remains pleasant at around 19–22°C, while winter brings cooler but still swimmable conditions, generally about 16–18°C. Spring sees a steady warm-up again, commonly sitting between 18–21°C as air temperatures rise and calmer days return.

Monthly Water Temperature Range (Min, Max & Average)

Month	Min	Avg	Max
January	19°C	22°C	25°C
February	19°C	22°C	25°C
March	20°C	23°C	25°C
April	19°C	22°C	24°C
May	19°C	22°C	24°C
June	17°C	21°C	23°C
July	17°C	20°C	22°C
August	17°C	19°C	20°C
September	17°C	19°C	20°C
October	16°C	19°C	21°C
November	17°C	19°C	22°C
December	18°C	21°C	23°C

* Click on a month to view detailed water temperature data.

Fremantle: Weather Forecast

October 16

15°C / 18°C

clear sky

humidity: 74% | wind: 7 kmh

October 17

13°C / 19°C

clear sky

humidity: 77% | wind: 11 kmh

October 18

13°C / 18°C

light rain

humidity: 79% | wind: 18 kmh

Local Water Conditions and Nearby Spots

Nearby Beaches and Water Temperatures

Bathers Beach

⭐ 4.2/5

19.7°C

South Beach

⭐ 5.0/5

19.7°C

South Fremantle Dog Beach

⭐ 5.0/5

19.2°C

Port Beach

⭐ 3.4/5

18.3°C

Leighton Beach

⭐ 5.0/5

19.6°C

C.Y. O'Connor Beach

⭐ 4.3/5

18.3°C

Leighton Beach Dog Exercise Area

⭐ 4.3/5

18.4°C

Mosman Beach

⭐ 3.9/5

17.7°C

Ngarkal Beach

⭐ 3.1/5

18.6°C

Swimming Conditions

Swimming in Fremantle is allowed and very popular, especially at beaches like South Beach and Bathers Beach. These areas offer sandy entry and, in some cases, partial protection from swell, making them suitable for casual swimmers and families when conditions are right. As with much of the Perth coast, mornings are often best for swimming before afternoon sea breezes increase chop. In summer, most people swim comfortably without wetsuits and enjoy longer sessions in the water. Spring and autumn suit relaxed dips, while winter swimming is usually for locals used to cooler temperatures or those wearing light thermal gear. Overall, Fremantle offers accessible and enjoyable swimming, combining mild seasonal water temperatures with a relaxed coastal setting close to the city.