Australian Government

Bureau of Meteorology


Coastal Waters Forecast 

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IDS11072

Australian Government Bureau of Meteorology
South Australia

Coastal Waters Forecast for South Australia

Issued at 5:10 am CST on Wednesday 18 June 2025
for the period until midnight CST Friday 20 June 2025.

Please be aware
Wind 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.

Warning Information

For latest warnings go to www.bom.gov.au, subscribe to RSS feeds, call 1300 659 210* or listen for warnings on relevant TV and radio broadcasts.

Weather Situation

A high pressure system over SA will slowly move eastwards but will continue to extend a ridge over the coastal waters for the remainder of the week and early next weekend.

Far West Coast: WA-SA Border to Fowlers Bay

Forecast for Wednesday 18 June until midnight

Winds: North to northeasterly 15 to 20 knots. Seas: 1 to 1.5 metres, decreasing to 1 metre during the afternoon. Swell: Southerly 1.5 to 2 metres, decreasing to 1.5 metres during the afternoon. Weather: Partly cloudy.

Forecast for Thursday 19 June

Winds: Northerly 15 to 20 knots. Seas: 1 to 1.5 metres, decreasing below 1 metre by early evening. Swell: Southwesterly 1 to 1.5 metres. Weather: Partly cloudy.

Forecast for Friday 20 June

Winds: Northerly 15 to 20 knots turning northeasterly during the afternoon. Seas: 1 to 1.5 metres, decreasing to 1 metre during the afternoon or evening. Swell: Southwesterly 1 to 1.5 metres. Weather: Cloud clearing.

Upper West Coast: Fowlers Bay to Elliston

Forecast for Wednesday 18 June until midnight

Winds: North to northeasterly 10 to 15 knots. Seas: Around 1 metre. Swell: Southwesterly 2 to 2.5 metres, tending southerly 1.5 to 2 metres around midday. Weather: Partly cloudy.

Forecast for Thursday 19 June

Winds: Northerly 15 to 20 knots. Seas: 1 to 1.5 metres, decreasing below 1 metre by early evening. Swell: Southwesterly 1.5 metres. Weather: Mostly sunny.

Forecast for Friday 20 June

Winds: Northerly 15 to 20 knots turning northeasterly during the afternoon. Seas: 1 to 1.5 metres, decreasing to 1 metre during the evening. Swell: Southwesterly 1.5 metres, increasing to 1.5 to 2 metres south of Streaky Bay. Weather: Partly cloudy.

Lower West Coast: Elliston to Cape Carnot

Forecast for Wednesday 18 June until midnight

Winds: Northerly 15 to 20 knots. Seas: Around 1 metre. Swell: Southwesterly 2 to 2.5 metres, tending southerly 2 metres during the afternoon, then tending southwesterly 1.5 to 2 metres later in the evening. Weather: Partly cloudy.

Forecast for Thursday 19 June

Winds: Northerly 15 to 20 knots. Seas: Around 1 metre, increasing to 1 to 1.5 metres during the morning. Swell: Southwesterly 1.5 metres. Weather: Partly cloudy.

Forecast for Friday 20 June

Winds: Northerly 15 to 20 knots turning northeasterly during the evening. Seas: 1 to 1.5 metres. Swell: Southwesterly 1.5 to 2 metres. Weather: Partly cloudy.

Central Coast

Forecast for Wednesday 18 June until midnight

Winds: Northerly 10 to 15 knots, reaching up to 20 knots in the west during the day. Seas: Around 1 metre, increasing to 1 to 1.5 metres in the west around midday. Swell: Southwesterly 2 to 2.5 metres. Weather: Cloudy.

Forecast for Thursday 19 June

Winds: Northerly 15 to 20 knots. Seas: 1 to 1.5 metres, increasing to 1 to 2 metres during the morning. Swell: Southwesterly 1 to 1.5 metres, increasing to 1.5 to 2 metres in the west. Weather: Partly cloudy.

Forecast for Friday 20 June

Winds: Northerly 15 to 20 knots turning northeasterly during the afternoon. Seas: Around 1 metre, increasing to 1 to 1.5 metres in the west. Swell: Southwesterly 2 metres. Weather: Mostly sunny.

South Central Coast

Forecast for Wednesday 18 June until midnight

Winds: Northerly 15 to 20 knots. Seas: Below 1 metre, increasing to 1 to 1.5 metres around midday. Swell: Southwesterly 2 to 3 metres. Weather: Cloudy.

Forecast for Thursday 19 June

Winds: Northerly 15 to 20 knots. Seas: 1 to 1.5 metres, increasing to 1 to 2 metres during the morning. Swell: Southwesterly 1.5 to 2 metres, decreasing to 1.5 metres during the morning, then increasing to 1.5 to 2 metres by early evening. Weather: Partly cloudy.

Forecast for Friday 20 June

Winds: Northerly 15 to 20 knots. Seas: 1 to 1.5 metres. Swell: Southwesterly 1.5 to 2 metres. Weather: Sunny.

Upper South East Coast: Murray Mouth to Cape Jaffa

Forecast for Wednesday 18 June until midnight

Winds: Northerly about 10 knots increasing to 10 to 15 knots in the morning. Seas: Around 1 metre. Swell: Southwesterly 2 to 3 metres, decreasing to 2 metres by early evening, then tending south to southwesterly 2 metres later in the evening. Weather: Cloudy.

Forecast for Thursday 19 June

Winds: Northerly 10 to 15 knots. Seas: Around 1 metre. Swell: Southwesterly 1 to 2 metres. Weather: Partly cloudy.

Forecast for Friday 20 June

Winds: Northerly 10 to 15 knots turning northeasterly during the afternoon. Seas: Around 1 metre. Swell: Southwesterly 1 to 2 metres. Weather: Sunny.

Lower South East Coast: Cape Jaffa to SA-VIC Border

Forecast for Wednesday 18 June until midnight

Winds: West to northwesterly about 10 knots tending north to northwesterly 15 to 20 knots in the morning. Seas: Around 1 metre, increasing to 1 to 1.5 metres offshore during the afternoon. Swell: Southwesterly 2 to 3 metres. Weather: Cloudy. 80% chance of showers.

Forecast for Thursday 19 June

Winds: Northerly 15 to 20 knots. Seas: Around 1 metre, increasing to 1 to 2 metres south of Beachport. Swell: Southwesterly 1.5 to 2 metres, tending westerly 1.5 to 2 metres during the afternoon. Weather: Partly cloudy.

Forecast for Friday 20 June

Winds: Northerly 15 to 20 knots. Seas: Around 1 metre, increasing to 1 to 1.5 metres south of Beachport. Swell: Westerly 1.5 to 2 metres, tending southwesterly 2 metres during the morning. Weather: Mostly sunny.

Spencer Gulf

Forecast for Wednesday 18 June until midnight

Winds: Northerly 10 to 15 knots. Seas: Below 1 metre. Swell: South to southwesterly 1 to 1.5 metres, decreasing to around 1 metre later in the evening. Weather: Partly cloudy.

Forecast for Thursday 19 June

Winds: Northerly 10 to 15 knots, reaching up to 20 knots near the Yorke Peninsula coast in the late morning and early afternoon. Seas: Around 1 metre. Swell: South to southwesterly around 1 metre. Weather: Mostly sunny.

Forecast for Friday 20 June

Winds: North to northeasterly 15 to 20 knots. Seas: Around 1 metre. Swell: South to southwesterly below 1 metre. Weather: Sunny.

Gulf St Vincent

Forecast for Wednesday 18 June until midnight

Winds: North to northeasterly 10 to 15 knots tending north to northwesterly below 10 knots in the late morning and early afternoon. Seas: Below 1 metre. Swell: West to southwesterly below 0.5 metres. Weather: Partly cloudy.

Forecast for Thursday 19 June

Winds: Northerly 10 to 15 knots. Seas: Below 1 metre. Swell: South to southwesterly below 0.5 metres. Weather: Mostly sunny.

Forecast for Friday 20 June

Winds: Northerly 10 to 15 knots tending northeasterly during the evening. Seas: Below 1 metre. Swell: South to southwesterly below 0.5 metres. Weather: Sunny.

Investigator Strait

Forecast for Wednesday 18 June until midnight

Winds: Northerly 10 to 15 knots. Seas: Below 1 metre. Swell: West to southwesterly around 1 metre, increasing to 1 to 1.5 metres through the Backstairs Passage. Weather: Cloudy.

Forecast for Thursday 19 June

Winds: Northerly 10 to 15 knots, reaching up to 20 knots through Backstairs Passage in the early afternoon. Seas: Around 1 metre. Swell: West to southwesterly around 1 metre. Weather: Partly cloudy.

Forecast for Friday 20 June

Winds: Northerly 10 to 15 knots turning northeasterly during the afternoon. Seas: Below 1 metre. Swell: West to southwesterly around 1 metre, increasing to 1 to 1.5 metres during the evening. Weather: Sunny.

The next routine forecast will be issued at 3:50 pm CST Wednesday.

* Calls to 1300 numbers cost around 27.5c incl. GST, higher from mobiles or public phones. Marine forecasts are also available on VHF and HF radio. View the radio schedule on www.bom.gov.au/marine

Check the latest Coastal Waters Forecasts for information on wind, wave and weather conditions for neighbouring coastal zones.