Phillip Island – Water Temperature Overview

This page provides information on Phillip Island locations where sea water temperature data is available, including current conditions, monthly ranges and historical records.

Current Water Temperature

18.8°C

minimum

18.9°C

average

19.0°C

maximum

The current water temperature in the Phillip Island today is 19°C. Thus, the average water temperature is about 19°C. Water in this range feels cool but still manageable for many swimmers. Short to moderate swims are comfortable, especially in warm weather. Some people may prefer a wetsuit for longer stays, particularly when swimming actively or outside peak summer conditions.

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.

Sea Temperature Trends

Water Temperature Over the Last 60 Days

Over the past month, the sea water temperature has remained largely unchanged. Overall, the sea water temperature is within the range expected based on historical data for this month.

Water Temperature and Swimming Conditions by Month

Month	Min	Avg	Max
January	15°C	19°C	22°C
February	17°C	20°C	22°C
March	17°C	19°C	21°C
April	15°C	18°C	20°C
May	14°C	16°C	18°C
June	12°C	14°C	16°C
July	10°C	13°C	15°C
August	10°C	12°C	14°C
September	11°C	13°C	15°C
October	12°C	14°C	16°C
November	14°C	16°C	18°C
December	15°C	18°C	21°C

Phillip Island, located just off the coast of Victoria, provides a unique set of swimming conditions that vary significantly between its northern and southern shores. The sea water temperatures reflect the island’s cool-temperate location in Bass Strait, with the warmest conditions typically occurring in February. During this summer peak, water temperatures generally range from 18°C to 20°C, which is refreshing but significantly cooler than the northern states. By the depth of winter in August, the temperature often drops to between 12°C and 14°C. While the summer months see many swimmers in standard swimwear, the cooler temperatures and frequent coastal breezes mean that surfers and long-distance swimmers usually wear full-length wetsuits year-round to manage the chill.

Swimming Conditions

Swimming is permitted and very popular across the island, though the choice of location is critical for safety. The northern beaches, such as Cowes and Silverleaves, offer sheltered, north-facing waters that are generally calm and shallow, making them ideal for families and casual wading. In contrast, the southern coastline, home to famous spots like Cape Woolamai and Smiths Beach, is far more rugged and prone to powerful swells and dangerous rip currents. Consequently, swimming is strictly advised only at patrolled beaches between the red and yellow flags. This is particularly important on Phillip Island, as several unpatrolled areas are notorious for their treacherous conditions. By sticking to monitored areas during the summer patrol season, visitors can safely enjoy the island's pristine waters while avoiding the risks associated with the unpredictable Southern Ocean.