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 Friday 6 December 2019.

Weather Situation

A deep surface trough just inland from the west coast will contract eastwards overnight and during tomorrow as a weak cold front approaches the southwest corner of the state. The cold front will move through southwestern parts of the South West Land Division during Saturday, with a ridge of high pressure developing rapidly in its wake on Sunday. A high pressure system will move south of the state on Monday, with a new surface trough developing inland from the west coast on Tuesday.

Forecast for Friday until midnight

Winds
Southwesterly 10 to 15 knots tending westerly in the evening.
Seas
1 to 1.5 metres, decreasing to 1 metre by early evening.
Swell
Southwesterly 1.5 metres.
Weather
Partly cloudy.

Saturday 7 December

Winds
Variable about 10 knots becoming west to northwest 10 to 15 knots before dawn. Northwest winds freshening to 15 to 20 knots during the morning, before becoming west to southwesterly 15 to 20 knots in the afternoon and easing to 10 to 15 knots in the late evening.
Seas
Around 1 metre, increasing to 1 to 1.5 metres during the morning.
Swell
Southwesterly 1.5 metres, increasing to 1.5 to 2 metres during the afternoon.
Weather
Partly cloudy. 70% chance of showers.

Sunday 8 December

Winds
Southerly 10 to 15 knots freshening to 15 to 20 knots in the afternoon and evening.
Seas
Around 1 metre.
Swell
Southwesterly 2 to 2.5 metres.
Weather
Partly cloudy.

Monday 9 December

Winds
Southeasterly 15 to 20 knots turning southerly and easing to 10 to 15 knots about midday. Wind shifting southwest 15 to 20 knots in the afternoon and increasing to 20 to 30 knots during the evening.
Seas
1 to 2 metres.
Swell
Southwesterly 1.5 to 2 metres, decreasing to 1 to 1.5 metres during the morning.
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 Saturday.

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