Mount Martha – current water temperature and swimming conditions

Water Temperature in Mount Martha: 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

Over the past month, water temperatures in Mount Martha have stayed mostly steady, but a warming trend has developed over the last week.

According to our forecast, Sea water temperature in Mount Martha will be 12.6°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

Mount Martha sits along the eastern side of the Mornington Peninsula, facing the sheltered waters of Port Phillip Bay with the Bass Strait further south, and this setting keeps water temperatures relatively stable through the year. In summer, the bay usually warms to around 19–23 °C, which feels comfortable for swimming and spending long stretches in the water. Autumn often stays mild, with temperatures commonly between 17–21 °C, while spring is cooler at roughly 15–19 °C as the bay slowly 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.