Perth Sea Temperature Guide | Monthly Averages & Trends
Perth, the sun-kissed capital of Western Australia, is renowned for its beautiful coastline and warm waters. Whether you’re planning a beach day, a dive trip or a surf session, knowing the sea temp can make all the difference. If you’re considering a Perth to Exmouth tours, understanding the coastal water variations along the way will help you plan the perfect stops for swimming and snorkelling.
Average Sea Temp
Perth’s sea temp varies throughout the year, influenced by seasons and ocean currents. Here’s a breakdown of the monthly sea temps:
- Summer (Dec – Feb): 21°C – 24°C (69°F – 75°F)
- Autumn (Mar-May): 20°C – 23°C (68°F – 73°F)
- Winter (Jun – Aug): 18°C – 20°C (64°F – 68°F)
- Spring (Sep – Nov): 19°C – 22°C (66°F – 72°F)
These temps make Perth’s waters perfect for year-round swimming, snorkelling and water activities. But in winter, some may find the water a bit cool, so a wetsuit is a good idea for longer swims or surfing. The coldest month for sea temps is usually July, when the minimum sea water temp is at its lowest.
Factors Affecting Sea Temp
Several factors contribute to the surface temp and variation in average water temp along Perth’s coast:
- Seasonal Changes: Perth experiences monthly fluctuations in sea surface temp, with the warmest water in late summer and early autumn.
- Leeuwin Current: This warm ocean current has a big impact on annual water temp, especially in winter months.
- Weather Conditions: Heavy rain, warm air temps and strong winds affect surface water temps and temp values.
- Geographical Location: Spots closer to river mouths will have different temp levels to open water.
- Satellite Imagery & Forecasting: Daily satellite readings, satellite images and weather trends give you real-time insights into current temps and historical water temps.
Best Time to Swim
If you like warm sea temperatures, the best time to swim is February and March as the ocean is still warm. If you’re doing a Perth to Exmouth trip, expect a transition from cold sea temperatures in Perth to warmer sea temperatures on the Coral Coast. The warm waters in the north make destinations like Coral Bay and Ningaloo Reef perfect for snorkelling and diving.
Perth Water & Weather Forecast
Weather forecast plays a big role in planning ocean activities. Factors like wind strength, wave height and downwind winds can affect surf breaks and surf forecasts. Perth’s beaches have consistent surf with average wave heights varying by season.
Other weather planner considerations:
- Tide Times: Knowing the time of day and time of sunrise can help you plan beach activities.
- Temperature Breaks & Anomalies: Understanding surface height anomalies and temperature breaks is crucial for predicting changes in ocean conditions.
- Beach Area Management: Some areas have different types of beaches, some more protected from strong winds.
Planning Your Ocean Adventure
Whether you’re a local or a visitor, knowing Perth’s sea temperature helps you make informed decisions for water activities. From surfing at Scarborough Beach to deep water at Rottnest Island, every beach along the coast has its own experience. If you’re making a Perth to Exmouth trip, knowing temperature by month and temperature averages will help you enjoy a range of temperatures along the way.
For accurate temps stay up to date with tide times, weather conditions and satellite imagery. Check the time of consultation for weather planner updates so your trip aligns with the best beach conditions.
No matter where you go, Perth’s ocean temperatures have something for everyone – from the highest temperature in summer to the lowest temperature in winter. Whether it’s a holiday or a quick beach trip, Perth’s beaches are waiting for you!
FAQ
Which month is the warmest for swimming in Perth?
February and March are the warmest with sea temps ranging from 22°C to 24°C (72°F – 75°F).
What is the coldest sea temperature in Perth?
July is the coldest month with minimum temps of 18°C (64°F).
How does Perth’s sea temperature compare to other Australian cities?
Perth is warmer than Melbourne but cooler than the northern cities like Darwin and Cairns.
Where can I check live sea temps in Perth?
Satellite maps, collective satellite readings and the Australian Bureau of Meteorology (BOM) have temperature images and values.
How do Perth’s ocean conditions affect marine life?
Changes in air temperature, water temps and weather trends affect marine ecosystems, dolphins, fish migrations and jellyfish blooms.