Grantham Island Weather Forecast

Spencer Gulf Coastal Waters

Wind

North to northwesterly 10 to 15 knots becoming variable about 10 knots in the middle of the day then becoming southeast to southwesterly 10 to 15 knots in the early afternoon. Winds reaching up to 20 knots north of Cowell to Wallaroo in the evening.

Seas

Below 1 metre, increasing to 1 to 1.5 metres north of Cowell to Wallaroo by early evening.

1st Swell

South to southwesterly below 1 metre, increasing to around 1 metre south of Cowell to Wallaroo.

Weather

Sunny.

Weather Situation

A broad ridge extends over inland parts of the state while a weak cold front clips the southeast late Monday. From Tuesday another high pressure system develops south of the Bight, strengthening the ridge over the state ahead of a trough of low pressure developing across the far northwest late Tuesday persisting late into the week.