Bonbeach – current water temperature and swimming conditions

Water Temperature in Bonbeach: 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 Bonbeach 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 Bonbeach will be 17.0°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

Bonbeach sits along the eastern side of Port Phillip Bay on the northern edge of the Mornington Peninsula, and its water temperatures reflect the calm, sheltered nature of the bay rather than the open Bass Strait. In summer, the water usually warms to around 19–23 °C, which feels comfortable for swimming and cooling off on hot days. Autumn often stays mild, with temperatures commonly between 17–21 °C, while spring is cooler at roughly 15–19 °C as the bay gradually warms after winter. During winter, water temperatures typically drop to about 13–15 °C, which feels cold but is still manageable for short swims on clear, calm days.