Gunnamatta Beach – current water temperature and swimming conditions

Water Temperature in Gunnamatta Beach: 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

Water temperatures in Gunnamatta Beach 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 Gunnamatta Beach 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

Gunnamatta Beach sits on the wild southern edge of the Mornington Peninsula, facing the open Bass Strait, and its water temperatures reflect the cool, exposed nature of this coastline. In summer, the ocean usually warms to around 18–22 °C, which feels refreshing rather than warm but is comfortable for swimming on sunny days. Autumn often remains mild, with water temperatures commonly between 16–20 °C, while spring is cooler at roughly 14–18 °C as the sea gradually warms after winter. During winter, water temperatures typically drop to about 11–14 °C, which is quite cold and generally limits swimming to short dips or those wearing wetsuits.