Melbourne Region – Water Temperature Overview

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

Current Water Temperature

20.1°C

minimum

20.2°C

average

20.3°C

maximum

The current water temperature in the Melbourne Region today is 20°C. Thus, the average water temperature is about 20°C. This water feels mild to warm and is comfortable for the majority of swimmers. Swimming is enjoyable, though longer stays may feel cooler for some people, especially in windy conditions. These temperatures are well suited to family outings and active swimming, particularly on warm days.

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	23°C
February	17°C	20°C	23°C
March	17°C	20°C	22°C
April	15°C	18°C	21°C
May	13°C	16°C	18°C
June	11°C	14°C	16°C
July	10°C	13°C	15°C
August	9°C	12°C	14°C
September	10°C	13°C	15°C
October	11°C	14°C	17°C
November	13°C	16°C	19°C
December	15°C	18°C	21°C

Melbourne, situated on the shores of Port Phillip Bay, offers a distinct swimming experience shaped by its large, relatively shallow harbour. Because the bay is partially enclosed, its water temperatures tend to be slightly higher than the open ocean in summer and cooler in winter. During the peak of the season in February, sea water temperatures typically range between 18°C and 21°C, providing a crisp but enjoyable environment for a dip on a hot afternoon. Conversely, mid-winter temperatures in August can drop to around 11°C to 13°C. While some hardy locals partake in bay swimming year-round, most recreational swimmers prefer the warmer months, and surfers heading to nearby ocean breaks like Torquay generally rely on thick, high-quality wetsuits to manage the cool Southern Ocean influence.

Swimming Conditions

Swimming is widely permitted and is a cornerstone of summer life at bayside suburbs like St Kilda, Brighton, and Williamstown. Safety is managed through designated swimming-only zones, which are clearly marked to keep swimmers separated from boats and personal watercraft. It is highly recommended to stick to patrolled areas where life saving clubs are active, as even the seemingly calm waters of the bay can harbour tricky sandbars and changing conditions. Additionally, water quality is a significant factor in Melbourne; the Environment Protection Authority (EPA) provides daily forecasts throughout summer. It is strongly advised to avoid swimming for 24 to 48 hours following heavy rain, as stormwater runoff can temporarily increase bacteria levels near drains and river mouths, making the water unsuitable for swimming.