St Helens – current water temperature and swimming conditions

Water Temperature in St Helens: 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 St Helens have stayed mostly steady, but a warming trend has developed over the last week.

According to our forecast, Sea water temperature in St Helens will be 18.7°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

St Helens sits on Tasmania’s north-east coast beside Georges Bay, with the Tasman Sea just beyond the heads, giving the area calmer water than many open beaches. Water temperatures here change steadily through the year and are among the more comfortable on the east coast. In summer, from December to February, the water usually reaches around 17–20 °C, which feels cool but pleasant for swimming on warm days. Autumn brings a gentle drop to about 15–17 °C, while winter is colder, typically around 11–13 °C. During spring, temperatures rise again, generally sitting between 13–15 °C as days lengthen and conditions improve.