Australian Government

Bureau of Meteorology


Coastal Waters Forecast 

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IDD11030

Australian Government Bureau of Meteorology
Northern Territory

Coastal Waters Forecast for the Northern Territory

Issued at 2:30 am CST on Tuesday 25 August 2026
for the period until midnight CST Thursday 27 August 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.

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 weak ridge extends over coastal waters from the east. A high crossing southern Australia during the week will direct southeasterly winds over north and eastern coastal waters from Wednesday.

Beagle Bonaparte Coast: WA-NT Border to Cape Fourcroy

Forecast for Tuesday 25 August until midnight

Winds: Variable about 10 knots. Seas: Below 1 metre. Swell: Below 0.5 metres. Weather: Mostly sunny.

Forecast for Wednesday 26 August

Winds: Variable below 10 knots becoming east to northeasterly 10 to 15 knots in the morning then tending northwest to southwesterly in the late afternoon. Seas: Below 1 metre. Swell: Below 0.5 metres. Weather: Mostly sunny.

Forecast for Thursday 27 August

Winds: Variable about 10 knots becoming west to southwesterly 10 to 15 knots during the afternoon then decreasing to below 10 knots during the evening. Seas: Below 1 metre. Swell: Below 0.5 metres. Weather: Sunny.

North Tiwi Coast: Cape Fourcroy to Cape Don

Forecast for Tuesday 25 August until midnight

Winds: Variable about 10 knots becoming east to northeasterly 10 to 15 knots in the late evening. Seas: Below 1 metre. Swell: East to northeasterly below 1 metre. Weather: Sunny.

Forecast for Wednesday 26 August

Winds: Easterly 15 to 20 knots turning northeasterly 10 to 15 knots in the evening. Seas: Around 1 metre. Swell: East to northeasterly around 1 metre. Weather: Sunny.

Forecast for Thursday 27 August

Winds: Easterly 10 to 15 knots decreasing to about 10 knots during the evening. Seas: Around 1 metre. Swell: East to northeasterly around 1 metre. Weather: Sunny.

Van Diemen Gulf

Forecast for Tuesday 25 August until midnight

Winds: Variable about 10 knots becoming northwest to northeasterly 10 to 15 knots in the early afternoon then tending northeasterly in the evening. Seas: Below 1 metre. Swell: Below 0.5 metres. Weather: Sunny.

Forecast for Wednesday 26 August

Winds: Easterly 10 to 15 knots tending northeasterly in the early afternoon. Winds reaching up to 20 knots inshore in the late afternoon. Seas: Below 1 metre. Swell: Below 0.5 metres. Weather: Sunny.

Forecast for Thursday 27 August

Winds: Easterly 10 to 15 knots turning north to northeasterly during the day then becoming variable about 10 knots during the evening. Seas: Below 1 metre. Swell: Below 0.5 metres. Weather: Sunny.

Arafura Coast: Cape Don to Cape Wessel

Forecast for Tuesday 25 August until midnight

Winds: Easterly 10 to 15 knots. Seas: Around 1 metre. Swell: Easterly below 1 metre. Weather: Mostly sunny.

Forecast for Wednesday 26 August

Winds: East to southeasterly 15 to 20 knots. Seas: Around 1 metre, increasing to 1 to 1.5 metres offshore during the morning. Swell: Easterly below 1 metre. Weather: Mostly sunny.

Forecast for Thursday 27 August

Winds: Southeasterly 15 to 20 knots. Seas: Around 1 metre, increasing to 1 to 1.5 metres offshore. Swell: Easterly below 1 metre. Weather: Sunny.

Gove Peninsula Coast: Cape Wessel to Cape Arnhem

Forecast for Tuesday 25 August until midnight

Winds: Easterly 10 to 15 knots, reaching up to 20 knots offshore north of Cape Wessel during the morning. Winds turning southeasterly during the morning and early afternoon. Seas: Below 1 metre, increasing to 1 to 1.5 metres offshore. Swell: Easterly below 1 metre. Weather: Mostly sunny.

Forecast for Wednesday 26 August

Winds: Southeasterly 15 to 20 knots. Seas: Around 1 metre, increasing to 1 to 1.5 metres offshore north of Cape Wessel during the morning. Swell: Northeast to southeasterly below 1 metre. Weather: Partly cloudy.

Forecast for Thursday 27 August

Winds: Southeasterly 15 to 20 knots. Seas: Around 1 metre, increasing to 1 to 1.5 metres inshore during the afternoon. Swell: East to southeasterly below 1 metre. Weather: Sunny.

Roper Groote Coast: Cape Arnhem to QLD-NT Border

Forecast for Tuesday 25 August until midnight

Winds: East to southeasterly about 10 knots increasing to 10 to 15 knots in the morning. Seas: Below 1 metre. Swell: Northeasterly below 1 metre. Weather: Sunny.

Forecast for Wednesday 26 August

Winds: Southeasterly 15 to 20 knots, reaching up to 25 knots offshore south of Numbulwar during the morning. Seas: Below 1 metre, increasing to 1 to 1.5 metres during the morning. Swell: East to northeasterly below 1 metre. Weather: Sunny.

Forecast for Thursday 27 August

Winds: Southeasterly 15 to 25 knots. Seas: 1 to 1.5 metres, increasing to 1 to 2 metres during the morning. Swell: East to southeasterly below 1 metre. Weather: Sunny.

Darwin Harbour

Forecast for Tuesday 25 August until midnight

Winds: North to northeasterly about 10 knots becoming northwesterly in the late afternoon then becoming west to southwesterly in the evening. Seas: Below 0.5 metres. Swell: Below 0.5 metres. Weather: Mostly sunny.

Forecast for Wednesday 26 August

Winds: East to northeasterly below 10 knots increasing to 10 to 15 knots in the middle of the day then tending north to northeasterly in the early afternoon. Seas: Below 1 metre. Swell: Below 0.5 metres. Weather: Sunny.

Forecast for Thursday 27 August

Winds: Variable about 10 knots becoming north to northwesterly 10 to 15 knots during the afternoon then turning west to southwesterly below 10 knots during the evening. Seas: Below 1 metre. Swell: Below 0.5 metres. Weather: Sunny.

The next routine forecast will be issued at 8:30 am CST Tuesday.

* 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 Forecasts for information on wind, wave and weather conditions for neighbouring coastal zones.