Johanna – current water temperature and swimming conditions

Water Temperature in Johanna: 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 Johanna 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 Johanna will be 17.5°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

Johanna sits on an exposed stretch of coastline in Victoria’s far west, facing directly into the Great Australian Bight, and this gives it some of the coldest and most powerful ocean conditions in the state. Water temperatures remain cool all year. In summer, the sea usually ranges from about 16–19°C, which feels brisk even on warm days. Autumn sees temperatures fall to roughly 14–17°C, while winter is very cold, often around 11–13°C. Spring brings only a slow warm-up, with water temperatures commonly between 12–15°C, and sudden cold changes are common after strong weather systems.