St Kilda – current water temperature and swimming conditions

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

According to our forecast, Sea water temperature in St Kilda will be 16.6°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 Kilda sits on the northern shores of Port Phillip Bay, with its water temperatures shaped by the bay’s relatively sheltered conditions rather than the full force of Bass Strait. In summer, the water is at its warmest and most inviting, usually ranging from about 18–22°C, which suits swimming on hot Melbourne days. Autumn brings a gradual cooling to around 16–19°C, while winter is noticeably cooler, often sitting between 12–14°C. Spring sees a slow warm-up, with water temperatures commonly around 14–17°C, influenced by sunshine, winds and changing weather patterns.