Perth City Coast – Water Temperature Overview
This page provides information on Perth City Coast locations where sea water temperature data is available, including current conditions, monthly ranges and historical records.
Current Water Temperature
The current water temperature in the Perth City Coast today is within the range of 17-21°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
Over the past month, the water temperature in the Perth City Coast has decreased by -2°C. 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 | 19°C | 22°C | 25°C |
| February | 19°C | 23°C | 26°C |
| March | 20°C | 23°C | 26°C |
| April | 19°C | 22°C | 24°C |
| May | 19°C | 22°C | 24°C |
| June | 17°C | 20°C | 23°C |
| July | 17°C | 20°C | 22°C |
| August | 17°C | 19°C | 21°C |
| September | 16°C | 19°C | 21°C |
| October | 16°C | 19°C | 21°C |
| November | 17°C | 20°C | 22°C |
| December | 18°C | 21°C | 24°C |
The Perth City Coast, famously known as the Sunset Coast, offers some of the most consistent and accessible swimming conditions in Western Australia. The local sea water temperatures are heavily influenced by the Leeuwin Current, which brings warm tropical water down from the north, ensuring the Indian Ocean remains relatively mild. During the peak of summer and into early autumn, specifically from February to March, the water temperature is at its most inviting, typically ranging between 21°C and 24°C. As the seasons transition into winter, the temperature cools, reaching its lowest point in August at approximately 17°C to 19°C. While many locals continue their morning swim routines throughout the year, recreational visitors generally find the summer and autumn months best for swimming without a wetsuit, as the afternoon Fremantle Doctor sea breeze provides a refreshing contrast to the hot land temperatures.
Swimming Conditions
Swimming is permitted and widely enjoyed at nineteen beautiful metropolitan beaches, including the iconic Cottesloe, City Beach, and Scarborough. Safety is a major priority, and swimming is strictly recommended only at patrolled beaches where surf lifesavers are on duty. These areas are marked by red and yellow flags, indicating the safest part of the beach free from dangerous rip currents and heavy shore breaks. This is particularly important on the Perth coast, where sandbars can shift quickly and create unexpected hazards. Additionally, several beaches such as Cottesloe and Coogee feature shark barrier nets during the warmer months to provide extra peace of mind for swimmers. Authorities also advise checking water quality alerts after heavy rainfall, as stormwater runoff can temporarily affect the pristine condition of the inner-city bays.