Coffin Bay – current water temperature and swimming conditions

Water Temperature in Coffin 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 Coffin 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 Coffin Bay will be 18.9°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

Coffin Bay sits on the southern side of the Eyre Peninsula, tucked into a large natural inlet that opens toward the Great Australian Bight, and this setting gives it a mix of sheltered and open-water influences. In summer, water temperatures are generally at their most comfortable, usually around 18–22°C, which feels cool but pleasant on warm days. Autumn brings a gradual cooling to roughly 16–19°C, while winter is noticeably colder, often around 13–15°C. Spring sees a slow warm-up, with water temperatures commonly sitting between 14–17°C, shaped by sunshine, winds and tidal movement within the bay.