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

View the current warnings for Western Australia

Forecast issued at 4:00 pm WST on Tuesday 18 March 2025.

Weather Situation

A trough just inland from the west coast will move east ahead of a weak cold front brushing past the southwest coast early Wednesday morning and along the south coast during Wednesday. A new ridge will develop along the south coast in the wake of the cold front on Wednesday and Thursday. Another trough will form down the west coast on Friday.

Forecast for Tuesday until midnight

Winds
Southerly 15 to 20 knots.
Seas
Around 1 metre.
Swell
Southwesterly 1.5 to 2 metres, decreasing to 1.5 metres by early evening.
Weather
Mostly clear.

Wednesday 19 March

Strong Wind Warning for Wednesday for Perth Coast

Winds
Southerly 15 to 25 knots tending south to southeasterly 25 to 30 knots in the evening.
Seas
1.5 to 2 metres.
Swell
Southwesterly 1.5 metres, increasing to 1.5 to 2 metres during the morning.
Weather
Partly cloudy.

Thursday 20 March

Winds
Southeasterly 15 to 25 knots turning southerly 15 to 20 knots in the middle of the day.
Seas
1.5 to 2.5 metres, decreasing to 1 metre during the morning, then increasing to 1 to 1.5 metres by early evening.
Swell
South to southwesterly 2 to 3 metres.
Weather
Sunny.

Friday 21 March

Winds
Southeasterly 15 to 20 knots turning southerly during the day.
Seas
1 to 1.5 metres.
Swell
Southwesterly 2 to 3 metres, decreasing to 1.5 to 2 metres during the evening.
Weather
Sunny.

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 4:00 am WST Wednesday.

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