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 18 September 2020.

Weather Situation

A broad surface trough will form lies inland from the west coast ahead of a cold front. The cold front will move over the southwest of the State on Saturday morning and will reach the Esperance coast by Saturday evening. A ridge develops over the central west coast in the wake of the front on Sunday and will slowly move southwards during Monday and Tuesday.

Forecast for Friday until midnight

Winds
Northwesterly 10 to 15 knots turning westerly 15 to 20 knots in the late evening.
Seas
Around 1 metre.
Swell
Southwesterly below 1 metre.
Weather
Mostly clear.

Saturday 19 September

Strong Wind Warning for Saturday for Perth Coast

Winds
Westerly 20 to 30 knots turning southwesterly 25 to 30 knots in the late afternoon.
Seas
1 to 1.5 metres, increasing to 2 to 3 metres during the morning.
Swell
Southwesterly below 1 metre, increasing to 2 to 3 metres during the morning.
Weather
Partly cloudy. 90% chance of showers. The chance of a thunderstorm in the late afternoon and evening. Possible hail in the afternoon and evening.

Sunday 20 September

Winds
Southwesterly 25 to 30 knots decreasing to 20 to 25 knots in the late afternoon.
Seas
2 to 3 metres.
Swell
Southwesterly 3 to 4 metres, increasing to 4 to 6 metres during the morning.
Weather
Cloudy. 70% chance of showers, with possible hail in the morning.

Monday 21 September

Winds
Southwesterly 15 to 20 knots decreasing to about 10 knots during the evening.
Seas
1.5 to 2 metres, decreasing to 1 metre during the morning.
Swell
Southwesterly 3 to 5 metres, decreasing to 2 to 3 metres during the afternoon.
Weather
Cloudy.

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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