Deepdene – current water temperature and swimming conditions

This page shows the current water temperature at Deepdene 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

18.2°C

Today

18.4°C

Yesterday

18.3°C

A Week Ago

The average sea water temperature today in Deepdene is about 18°C.

Water Temperature in Deepdene: 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 Deepdene have generally increased, although a slight cooling trend has set in over the last week.

According to our forecast, Sea water temperature in Deepdene will be 18.1°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	18.5°C	18.5°C
Oct 8	18.5°C	18.3°C
Oct 9	18.3°C	18.3°C
Oct 10	18.3°C	18.0°C
Oct 11	18.4°C	18.0°C
Oct 12	18.4°C	18.3°C
Oct 13	18.4°C	18.0°C
Oct 14	18.4°C	18.0°C
Oct 15	18.2°C	18.0°C	18.2°C
Oct 16		18.0°C	18.2°C
Oct 17		18.3°C	18.2°C
Oct 18		18.0°C	18.1°C
Oct 19		17.8°C	18.1°C
Oct 20		18.3°C	18.1°C
Oct 21		18.0°C	18.1°C
Oct 22		18.5°C	18.1°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 Deepdene 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

Deepdene sits between Augusta and the southern edge of the Margaret River region, facing the open Indian Ocean with a mix of rocky headlands and small pocket beaches. Water temperatures here are cool but consistent through the year. In summer, from December to February, the sea generally ranges between 19–22°C, which feels comfortable on warm, settled days. Autumn brings a gradual cooling to around 17–20°C. Winter is noticeably colder and more bracing, usually about 14–16°C, while spring sees a slow warm-up again to roughly 16–18°C, though southerly winds can make the water feel cooler than expected.

Monthly Water Temperature Range (Min, Max & Average)

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

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

Deepdene: Weather Forecast

October 16

17°C / 18°C

broken clouds: 51-84%

humidity: 70% | wind: 18 kmh

October 17

14°C / 19°C

light rain

humidity: 77% | wind: 18 kmh

October 18

10°C / 17°C

broken clouds: 51-84%

humidity: 67% | wind: 14 kmh

Local Water Conditions and Nearby Spots

Nearby Beaches and Water Temperatures

Deepdene Beach

⭐ 3.5/5

18.3°C

Foul Bay

⭐ 3.5/5

18.6°C

Hamelin Bay

⭐ 4.3/5

19.0°C

Neretlis Beach

⭐ 2.5/5

18.3°C

Swimming Conditions

Swimming at Deepdene is allowed, but conditions mean it’s best suited to confident swimmers. The coastline is fairly exposed, and swell and currents can build quickly when weather changes. On calm summer days, swimming can be very enjoyable, with clear water and sheltered corners offering manageable entry points. These spots are best for short to moderate swims rather than long, relaxed sessions. In summer, many people swim without wetsuits, while spring and autumn suit shorter dips. Winter swimming is usually limited to locals accustomed to cooler water or those wearing thermal gear. Overall, Deepdene offers a more natural, low-key swimming experience, combining cool Indian Ocean water with a rugged coastal setting that rewards careful choice of conditions.