Marion Bay – current water temperature and swimming conditions

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

According to our forecast, Sea water temperature in Marion Bay will be 14.9°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

Marion Bay sits on Tasmania’s south-east coast, opening onto the Tasman Sea with a long, sandy shoreline and clear, cool water. Sea temperatures here follow a steady east coast pattern. In summer, from December to February, the water usually reaches around 16–18 °C, which feels refreshing but is comfortable enough for swimming on warm days. Autumn brings a gradual cooling to about 14–16 °C, while winter is noticeably colder, commonly around 11–13 °C. During spring, the sea slowly warms again, generally sitting between 13–15 °C as daylight increases and weather conditions begin to settle.