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Upper South East Coastal Waters Forecast: Murray Mouth to Cape Jaffa

View the current warnings for South Australia

Forecast issued at 9:30 am CST on Monday 7 September 2026.

Weather Situation

The tail end of a cold front will move across southern coasts early Monday then a high pressure system centred southwest of WA will extend a ridge across the south of SA. The main high centre will move to the east of SA late Thursday and Friday. A trough over the interior of WA will remain stationary for most of the week.

Forecast for Monday until midnight

Winds
South to southeasterly 15 to 20 knots tending east to southeasterly 10 to 15 knots during the afternoon and evening.
Seas
Around 1 metre.
Swell
Southwesterly 2 to 2.5 metres.
Weather
Mostly sunny.

Tuesday 8 September

Winds
Variable about 10 knots becoming south to southwesterly 15 to 20 knots in the late afternoon. Winds reaching up to 25 knots offshore in the late evening.
Seas
Below 1 metre, increasing to 1 to 1.5 metres later in the evening.
Swell
Southwesterly 2.5 to 3 metres.
Weather
Becoming cloudy.

Wednesday 9 September

Winds
Southerly 20 to 25 knots turning southeasterly 15 to 20 knots during the day.
Seas
1.5 to 2 metres, decreasing to 1 to 1.5 metres during the afternoon.
Swell
Southwesterly 3 metres, increasing to 3 to 5 metres during the morning.
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

WA - Eucla Coast - Coastal Waters Forecast Vic - West Coast - Coastal Waters Forecast SA - Lower South East Coast - Coastal Waters Forecast SA - Upper South East Coast - Coastal Waters Forecast SA - Adelaide Metropolitan Waters Forecast SA - Gulf St Vincent - Coastal Waters Forecast SA - Spencer Gulf - Coastal Waters Forecast SA - Investigator Strait - Coastal Waters Forecast SA - South Central Coast - Coastal Waters Forecast SA - Central Coast - Coastal Waters Forecast SA - Lower West Coast - Coastal Waters Forecast SA - Upper West Coast - Coastal Waters Forecast SA - Far West Coast - Coastal Waters Forecast

The next routine forecast will be issued at 3:30 pm CST Monday.

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