Perth — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Perth (Australia). It includes the current water temperature, daily data for the last month presented in a simple chart, and a 7-day forecast. The page also compares today’s value with typical averages for this period, shows usual monthly ranges during the year, and lists nearby beaches with short descriptions. Local weather for the next few days and general details about Perth help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Perth in the Indian Ocean today is 20°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience.
It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Currently, the sea water temperature at this location matches the average for this day in previous years.
According to our forecast, Water temperature in Perth will be 21.0°C in the next 7 days. See the table below for daily data for the upcoming week.
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| JUN 1 | 20.6°C | 21.0°C | |
| JUN 2 | 20.6°C | 21.0°C | |
| JUN 3 | 20.2°C | 21.0°C | |
| JUN 4 | 20.4°C | 21.3°C | |
| JUN 5 | 20.4°C | 21.0°C | |
| JUN 6 | 20.0°C | 20.8°C | |
| JUN 7 | 19.9°C | 20.8°C | |
| JUN 8 | 20.1°C | 21.0°C | |
| JUN 9 | 20.2°C | 21.0°C | 20.2°C |
| JUN 10 | 21.0°C | 20.3°C | |
| JUN 11 | 21.0°C | 20.4°C | |
| JUN 12 | 21.0°C | 20.6°C | |
| JUN 13 | 21.3°C | 20.7°C | |
| JUN 14 | 20.8°C | 20.8°C | |
| JUN 15 | 21.3°C | 20.9°C | |
| JUN 16 | 20.8°C | 21.0°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Water temperature data for this location is gathered from various sources, including buoys and satellite sea and ocean surface maps provided by the NOAA agency. We also incorporate data from local authorities in each specific location worldwide to ensure more accurate temperature readings.
Annual Water Temperature Overview by Month
Monthly Water Temp Ranges
Annual Water Temperature Trend
Perth sits on the western coast of Australia and fronts the warm-tempered Indian Ocean, though waters are noticeably cooler than the subtropical air. Seasonal sea surface temperatures around metropolitan Perth typically range through the year: in summer (December–February) water temperatures average about 21–24 °C, autumn (March–May) cools slightly to roughly 19–22 °C, winter (June–August) brings the coldest conditions near 16–18 °C, and spring (September–November) warms again to about 17–21 °C. Shallow sheltered bays and tidal pools can feel a degree or two warmer in calm conditions, while open-ocean exposures and southerly swells may be several degrees cooler. These averages vary with weather patterns, ocean currents and occasional warm-season upwellings, so local readings can differ from seasonal norms.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 20°C | 23°C | 24°C |
| February | 20°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 | 18°C | 21°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 | 17°C | 19°C | 21°C |
| November | 17°C | 20°C | 22°C |
| December | 18°C | 21°C | 23°C |
* Click on a month to view detailed water temperature data.
Perth: Weather Forecast
June 10
June 11
June 12
Location, Beaches & Local Information
Swimming Conditions
Swimming and beach holidays in Perth are popular in the warmer months when coastal water temperatures are most inviting for bathers. Patrolled sandy beaches along the metropolitan coastline are well suited to family swimming, while nearby islands and sheltered bays offer calmer, often slightly warmer spots for snorkeling and casual diving. Surf beaches attract board riders when swells pick up, and quieter coves appeal to those seeking relaxed paddling or reef exploration. Outside the peak summer period many visitors and locals use wetsuits for comfort, and anyone entering the water should be mindful of rip currents, changing tides and local beach safety advice. Overall, Perth provides a good mix of accessible summer swimming and year-round coastal activities, with water temperatures that can be brisk outside mid-summer.