Garden Island – current water temperature and swimming conditions

This page shows the current water temperature at Garden Island 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

23.0°C

Today

22.5°C

Yesterday

22.7°C

A Week Ago

The average sea water temperature today in Garden Island is about 23°C.

Water Temperature in Garden Island: Daily Trends, Historical Records, and Forecast

✅ This water feels mild to warm and is comfortable for the majority of swimmers. Swimming is enjoyable, though longer stays may feel cooler for some people, especially in windy conditions. These temperatures are well suited to family outings and active swimming, particularly on warm days.

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 February 18 to March 20

Water temperatures in Garden Island have been on a steady rise over the past month and have continued to climb over the last week.

According to our forecast, Sea water temperature in Garden Island will be 22.4°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
Mar 12	23.5°C	22.8°C
Mar 13	23.4°C	22.5°C
Mar 14	22.7°C	22.8°C
Mar 15	22.5°C	22.3°C
Mar 16	22.4°C	22.5°C
Mar 17	22.2°C	22.5°C
Mar 18	22.3°C	23.0°C
Mar 19	22.5°C	22.8°C
Mar 20	23.0°C	22.8°C	23.0°C
Mar 21		23.0°C	22.9°C
Mar 22		23.3°C	22.8°C
Mar 23		23.0°C	22.8°C
Mar 24		23.3°C	22.7°C
Mar 25		21.5°C	22.6°C
Mar 26		21.8°C	22.5°C
Mar 27		22.3°C	22.4°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 Garden Island 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

Garden Island lies just off the coast of Rockingham and marks the transition between sheltered mainland waters and the open Indian Ocean. Sea temperatures here follow the Perth City Coast pattern and are generally pleasant for swimming. In summer, from December to February, the water typically ranges between 21–24°C, often feeling warm and clear on calm days. Autumn remains comfortable at around 19–22°C. Winter brings cooler conditions, usually about 16–18°C, which can feel brisk but are still manageable for short swims. Spring sees a steady warm-up again, generally sitting between 18–21°C as air temperatures rise.

Monthly Water Temperature Range (Min, Max & Average)

Month	Min	Avg	Max
January	19°C	22°C	24°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	22°C
July	17°C	20°C	22°C
August	17°C	19°C	20°C
September	16°C	19°C	20°C
October	16°C	19°C	21°C
November	17°C	19°C	21°C
December	18°C	21°C	23°C

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

Garden Island: Weather Forecast

March 21

19°C / 25°C

clear sky

humidity: 72% | wind: 18 kmh

March 22

19°C / 27°C

clear sky

humidity: 62% | wind: 25 kmh

March 23

17°C / 28°C

clear sky

humidity: 64% | wind: 25 kmh

March 24

17°C / 26°C

clear sky

humidity: 64% | wind: 22 kmh

Local Water Conditions and Nearby Spots

Nearby Beaches and Water Temperatures

Garden Island

⭐ 4.6/5

23.1°C

John Point Beach

⭐ 4.3/5

23.5°C

Cape Peron

⭐ 3.9/5

21.8°C

Peron Foreshore Park

⭐ 3.8/5

23.9°C

Palm Beach

⭐ 4.6/5

22.5°C

Naval Memorial Park Beach

⭐ 4.6/5

24.1°C

Mangles Bay

⭐ 4.3/5

22.3°C

Kwinana Beach

⭐ 4.3/5

23.6°C

Shoalwater Bay

⭐ 5.0/5

21.7°C

Swimming Conditions

Swimming at Garden Island is allowed in designated public access areas, but much of the island is a restricted naval base, so access is limited and controlled. Where swimming is permitted, conditions are often very good, with clear water, sandy patches, and some protection from heavy swell depending on the side of the island. In summer, most people swim comfortably without wetsuits and can enjoy longer sessions in the water. Spring and autumn suit relaxed dips, while winter swimming tends to appeal to locals accustomed to cooler water or those using light thermal gear. Overall, Garden Island offers high-quality swimming in clean Indian Ocean water, with the added caveat that visitors must stick to approved areas and respect access restrictions.