Newcastle – current water temperature and swimming conditions

Water Temperature in Newcastle: 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 Newcastlefell over the past month, but have levelled out during the last week.

According to our forecast, Sea water temperature in Newcastle will be 18.3°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

Newcastle, on the New South Wales coast north of Sydney, fronts the open Tasman Sea and has water temperatures that suit swimming for much of the year. In summer, the ocean is at its warmest, usually sitting around 22–26 °C, which feels comfortable for long swims and regular dips. Autumn brings a gradual cooling to roughly 20–23 °C, still pleasant for most people. Winter is cooler but far from icy, with sea temperatures typically between 16–20 °C, while spring sees a steady warm-up from about 18 °C into the low twenties as weather conditions become more settled.