Rapid Bay – current water temperature and swimming conditions

Water Temperature in Rapid Bay: 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 Rapid Bay 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 Rapid Bay will be 14.5°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

Rapid Bay sits on the western side of the Fleurieu Peninsula, tucked into a small bay that offers some shelter from the full force of the Great Australian Bight. Water temperatures follow a cool southern pattern through the year. In summer, the sea is usually at its warmest, sitting around 18–22°C, which feels refreshing and comfortable on warm days. Autumn sees a gradual cooling to roughly 16–19°C, while winter brings noticeably colder water, often around 13–15°C. Spring is a slow warm-up period, with temperatures commonly between 14–17°C, influenced by sunshine, winds and changing sea conditions.