Marion Bay – current water temperature and swimming conditions

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

❌ Water at this temperature feels cold and is generally suitable only for brief immersion. Swimming without a wetsuit can quickly become uncomfortable, and exposure time is usually short. These conditions are mainly suitable for experienced swimmers or those using proper thermal gear.

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 Marion Bay have been on a steady rise over the past month and have continued to climb over the last week.

According to our forecast, Sea water temperature in Marion Bay will be 12.5°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.