Coalcliff – current water temperature and swimming conditions

Water Temperature in Coalcliff: 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 Coalcliff declined overall during the past month, they have shown a noticeable rebound over the last week.

According to our forecast, Sea water temperature in Coalcliff 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

Coalcliff sits beneath the Illawarra escarpment, with a narrow strip of coast facing straight into the Tasman Sea. Water temperatures here reflect full open-ocean conditions and follow the familiar seasonal pattern of the New South Wales coastline. In summer, from December through March, the sea usually ranges between 21–24 °C, which is comfortable for most swimmers without needing a wetsuit. Autumn brings a steady cool-down to around 19–21 °C. Winter is the coldest period, typically seeing water temperatures between 16–18 °C, while spring marks a gradual warm-up into the 18–20 °C range as currents and weather begin to shift.