IDS10035
Australian Government Bureau of Meteorology
South Australia
Issued at 3:40 am CDT on Sunday 18 January 2026
for the period until midnight CDT Wednesday 21 January 2026.
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.
A high pressure system centred over the southern Tasman Sea extends a ridge over waters south of SA. Later today a trough will begin to move in from the west and will reach central districts in the evening then will move eastwards on Monday and will persist over the eastern states mid week. Another high will develop over waters south of the Bight mid next week and will extend a ridge northwards over western SA.
Winds: Variable about 10 knots becoming south to southwesterly 10 to 15 knots in the late afternoon then turning east to southeasterly below 10 knots in the evening. Seas: Below 1 metre. Swell: Westerly below 0.5 metres. Weather: Sunny.
Winds: East to northeasterly 10 to 15 knots shifting southwesterly 15 to 20 knots before dawn then tending southerly in the evening. Winds reaching up to 25 knots north of Grange in the evening. Seas: Below 1 metre, increasing to 1 to 2 metres around midday. Swell: West to southwesterly below 0.5 metres. Weather: Sunny.
Winds: South to southwesterly 15 to 25 knots. Seas: 1 to 1.5 metres, increasing to 1 to 2 metres during the afternoon or evening. Swell: West to southwesterly below 0.5 metres. Weather: Partly cloudy.
Winds: Southerly 15 to 25 knots. Seas: 1 to 1.5 metres, increasing to 1 to 2 metres during the afternoon or evening. Swell: West to southwesterly below 0.5 metres. Weather: Partly cloudy.
The next routine forecast will be issued at 9:30 am CDT Sunday.
* Calls to 1300 number cost around 27.5c inc. 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 Forecast or Local Waters Forecast at http://www.bom.gov.au/sa/forecasts/map.shtml for information on wind, wave and weather conditions for these coastal zones.