Hearnes Lake Beach – current water temperature and swimming conditions

Water Temperature in Hearnes Lake Beach: 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

Over the past month, water temperatures in Hearnes Lake Beach have stayed mostly steady, but a warming trend has developed over the last week.

According to our forecast, Sea water temperature in Hearnes Lake Beach will be 20.3°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

Hearnes Lake Beach sits on the far north coast of New South Wales near Woolgoolga, where a coastal lake meets the Tasman Sea in a quiet, natural setting. Water temperatures here reflect the region’s warm subtropical climate and stay comfortable for swimming across much of the year. In summer, the ocean typically warms to around 25–27 °C, while the lake itself often feels just as warm or slightly warmer on still days. Autumn usually remains pleasant, with water temperatures sitting between 23–25 °C. Spring starts cooler at roughly 21–23 °C before steadily warming toward summer. Winter is the coolest period, but even then temperatures generally stay around 18–21 °C, which many locals still find suitable for a swim on sunny days.