Mystery Bay – current water temperature and swimming conditions

Water Temperature in Mystery Bay: Daily Trends, Historical Records, and Forecast

⚠️ Water in this range feels cool but still manageable for many swimmers. Short to moderate swims are comfortable, especially in warm weather. Some people may prefer a wetsuit for longer stays, particularly when swimming actively or outside peak summer conditions.

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 Mystery Bay 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 Mystery Bay will be 17.9°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

Mystery Bay sits on the Far South Coast of New South Wales, opening straight onto the Tasman Sea, and its water temperatures reflect the cooler nature of this southern coastline. In summer, the ocean usually warms to around 20–23 °C, which feels refreshing but comfortable for swimming on warm days. Autumn often stays mild, with temperatures commonly between 18–21 °C, while spring is cooler at roughly 16–19 °C as the sea slowly warms after winter. During winter, water temperatures typically drop to about 14–16 °C, which can feel quite cold without a wetsuit and generally limits swimming to short, bracing dips.