Portsea Ocean Beach — known locally as "Back Beach" — is a wild 2.5 km stretch of white sand on the ocean side of the Mornington Peninsula, within Mornington Peninsula National Park. Exposed to the full force of Bass Strait, this beach features powerful rolling swells, deep rip currents, and offshore reefs that create dramatic surf conditions. Unlike the calm waters of Port Phillip Bay, this is a raw, energetic coastline where snorkelers need strong swimming ability. The beach is backed by low coastal heath and dramatic cliffs, offering a sense of remoteness despite being close to the resort town of Portsea.
Portsea Ocean Beach (Back Beach)
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SKIP
Poor conditions. Stay out today.
Showing last known conditions
Wave Height 1.5 mSwell Period 12 sWind Speed 2.3 knPrecipitation 32 mmTidal Phase flood
Last evaluated
DANGER: Explicit Risks Present
Portsea Ocean Beach (Back Beach) has hazards marked as danger. Entering the water here means you may face serious risks to your personal safety.
- Strong Rips and Shore Dumps danger
Powerful rip currents and shore break (dumping waves) are common year-round. Only swim between the flags when lifeguards are on duty.
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Community contribution: submitted by Daniel
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High risk: Strong Rips and Shore Dumps
Powerful rip currents and shore break (dumping waves) are common year-round. Only swim between the flags when lifeguards are on duty.
Moderate risk: Offshore Reefs and Rocks
Submerged rocky reefs line the beach, creating uneven bottom contours and sudden shallow areas hazardous in surf.
Moderate risk: Large Swell Conditions
Bass Strait generates consistent large swells, especially during winter (June–August) and spring, making entry and exit difficult.
Low risk: Cold Water Temperatures
Ocean water temperature ranges from 12–18°C, with significant cold shock risk for unprepared swimmers and snorkelers.
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Getting in
Shore entry
Entry
From Melbourne, take the M1 to the Mornington Peninsula Freeway, then follow the signs to Portsea. Turn onto Point Nepean Road and then onto Back Beach Road, which leads to the beach car park. The beach is approximately 1.5 hours drive from Melbourne CBD.
Parking & facilities
Limited roadside parking is available along Back Beach Road. Spaces fill quickly on summer weekends and public holidays.
toiletsparking
No entry fee. Part of Mornington Peninsula National Park — no park fees apply for beach access.
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About this data
- Conditions last evaluated
- Spot data last updated
- Data sources
- Open-Meteo (marine & weather conditions), tide predictions via UTide, community contributors (descriptions, hazards, marine life).
- License
- Spot content licensed under CC BY-SA 4.0. How's the Spot is open source.
Weather & swell ┬╖ Open-Meteo marine & weather APIs Tides ┬╖ UTide harmonic analysis Sea & safety ┬╖ community reports