

Seal Island's main draw is simple: Australian sea lions. These curious, playful animals regularly interact with snorkellers and divers in the shallow reef and seagrass areas that surround the island. Depths run from 3 to 8 metres, making this very manageable for beginners. Visibility is variable, so some days will be clearer than others, and currents can shift, so keep an eye on conditions before you get in. Beyond the sea lions, you can expect reef fish, stingrays, and the occasional dolphin passing through. Boat traffic is the main hazard here, so stay close to your vessel and use a surface marker when ascending.
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The best months to visit run from September through February, when conditions are generally more settled and sea lion activity tends to be reliable. Keep a close eye on the current before entering, as it can pick up quickly around the island.
The site is approximately 900m offshore and must be accessed by boat, kayak, or a guided tour. Private kayaks can be launched from Shoalwater Foreshore Reserve. Commercial tours often depart from Mersey Point Jetty in Rockingham. Landings on the island itself are restricted.
The primary challenge is the 900m open water crossing from the mainland by kayak or small boat; be mindful of changing wind and wave conditions for the return journey. The area can be busy with tour boats and private vessels.
Depth
3-8m
Visibility
10-15m
Skill Level
Beginner
Entry
Boat
Boat required
Water Temp
29-32°C
Current
Mild
Typical Dive
45 min
Best Time
Jan, Feb, Sep, Oct, Nov, Dec
Yes, Seal Island in South West is a boat-access-only dive site. You will need to book with a local dive operator or charter a boat to reach it.
Yes, parking is available near Seal Island. Arrive early during peak seasons as spaces can fill up quickly.
Seal Island in South West is well-suited for beginner divers and snorkellers. Conditions are typically calm with easy entry and shallow depths.
Diving at Seal Island in South West requires the following certifications: Open Water. Always dive within your training limits.
A rashguard or 2mm shorty is recommended for diving at Seal Island in South West. Water temperatures range from 29°C to 32°C.
Seal Island in South West is home to Australian sea lions, dolphins, reef fish, and stingray. Marine life sightings vary by season and conditions.
The best months to visit Seal Island in South West are January, February, September, October, November, and December. Conditions outside these months can still be good but are less predictable.
Seal Island in South West has depths ranging from 3 metres to 8 metres.
Seal Island in South West offers snorkelling with a rating of 1 out of 5. Shallow areas start from 3 metres, making it accessible for snorkellers.
A typical dive at Seal Island in South West lasts approximately 45 minutes. Actual dive time depends on depth, air consumption, and conditions.
Divers at Seal Island in South West should be aware of sharks. These encounters are generally rare and avoidable with proper awareness. Follow local safety guidance and maintain a respectful distance from all marine life.
Seal Island in South West typically has mild currents that most divers can handle comfortably.
Visibility at Seal Island in South West typically ranges from 10 metres to 15 metres. Conditions vary with weather, tides, and seasons.