Garden Island – current water temperature and swimming conditions

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

⚠️ This is cool water that may feel brisk on entry. Swimming is usually limited to short sessions, and prolonged stays can become uncomfortable without thermal protection. Many swimmers choose a wetsuit, especially for surfing or open-water swimming.

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

While water temperatures in Garden Island declined overall during the past month, they have shown a noticeable rebound over the last week.

According to our forecast, Sea water temperature in Garden Island 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

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.