Cape Douglas – current water temperature and swimming conditions

Water Temperature in Cape Douglas: 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

Water temperatures in Cape Douglas have been gradually cooling over the past month, with a further drop recorded during the last week.

According to our forecast, Sea water temperature in Cape Douglas will be 18.0°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

Cape Douglas sits along the rugged south-east coastline of South Australia, fully exposed to the Southern Ocean and the Great Australian Bight, and this keeps water temperatures cool year-round. In summer, the sea is usually at its warmest, typically around 17–20°C, which still feels brisk but can be refreshing on warm, calm days. Autumn brings a steady drop to roughly 15–18°C, while winter is distinctly cold, often sitting between 12–14°C. Spring warms slowly, with water temperatures commonly in the 13–16°C range, and sudden cold changes can follow strong southerly weather.