Perth Coastal Waters Forecast: Two Rocks to Dawesville, offshore from Rottnest Island

View the current warnings for Western Australia

Forecast issued at 1:08 am WST on Friday 17 July 2026.

Weather Situation

A ridge pushes into central parts of the state as a cold front moves over the south of the state today. A second cold front will follow later Friday and into Saturday. A weak ridge will push over the central west coast on Sunday with another front approaching the far southwest corner later Monday.

Forecast for Friday until midnight

Winds
Variable about 10 knots becoming north to northeasterly 15 to 20 knots in the middle of the day then turning northwesterly 15 to 25 knots in the early afternoon.
Seas
Around 1 metre, increasing to 1 to 1.5 metres during the afternoon.
Swell
Southwesterly 2.5 metres, tending westerly 2.5 metres during the afternoon.
Weather
Partly cloudy. 95% chance of showers. The chance of a thunderstorm this afternoon.

Saturday 18 July

Strong Wind Warning for Saturday for Perth Coast

Winds
West to northwesterly 20 to 25 knots becoming westerly 20 to 30 knots before dawn then decreasing to 15 to 25 knots in the morning.
Seas
1.5 to 2.5 metres, decreasing to 1 to 1.5 metres during the afternoon.
Swell
Westerly 2.5 to 3 metres, increasing to 3 to 5 metres during the morning, then tending southwesterly 4 to 5 metres by early evening.
Weather
Partly cloudy. 90% chance of showers.

Sunday 19 July

Winds
Westerly 10 to 15 knots turning south to southwesterly below 10 knots during the morning then becoming south to southeasterly during the evening.
Seas
Below 1 metre.
Swell
Southwesterly 3 to 5 metres, decreasing to 3 metres during the afternoon or evening.
Weather
Partly cloudy. 80% chance of showers.

Please be awareWind and wave forecasts are averages. Wind gusts can be 40 per cent stronger than the forecast, and stronger still in squalls and thunderstorms. Maximum waves can be twice the forecast height.

Nearby Coastal Waters

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The next routine forecast will be issued at 7:01 am WST Friday.

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