Marley – current water temperature and swimming conditions

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

According to our forecast, Sea water temperature in Marley 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

Marley sits along the Illawarra coastline, backed by bushland and opening straight onto the Tasman Sea. Water temperatures here reflect true open-ocean conditions and follow a clear seasonal pattern. In summer, from December to March, the sea is usually at its warmest, around 21–24 °C, which is comfortable for most swimmers without a wetsuit. Autumn brings a steady cool-down to roughly 19–21 °C. Winter is the coldest time of year, with water temperatures typically between 16–18 °C, while spring sees a gradual rise back into the 18–20 °C range as currents and air temperatures begin to warm.