Heavy rain and wind forecast for NSW coast
Possible waves up to 13metres high

Australians on the New South Wales coast have been warned to brace for intense wind and rain as a low pressure system intensifies over the weekend.

An east coast low will sweep over the state's coastal areas from early next week.

The system will form and linger on the east coast for at least 24 hours, Weatherzone meteorologist Felix Levesque has said.

The east coast low could arrive earlier if a coastal trough deepens off northern NSW on Monday, he said.

The forecaster said the system could bring showers and wind gusts which could escalate into heavy and potentially flooding rainfall as well as damaging winds.

An alarming map from Weatherzone, which modelled mean sea level pressure and 24-hour rainfall for the low near the Mid North Coast, appeared covered in red.

The forecaster said strong winds would cause large waves across the Tasman Sea.

Waves could reach as high as 13metres near coastal parts of the Sydney, Central Coast, Hunter and Mid North Coast regions between Tuesday and Thursday.

Waves could reach as high as 13metres near coastal parts of the Sydney, Central Coast, Hunter and Mid North Coast regions between Tuesday and Thursday (Bronte pool is pictured)

Weatherzone's modelling has predicted high sea level pressure and 24-hour rainfall (pictured)

Up to 100-200mm of rain could fall in the 36-48 hours up to Thursday in the Mid North Coast and Hunter, which could extend as far as the South Coast.

Rainfall of up to 300mm is possible in some parts of Mid North Coast, Hunter and Central Coast.

Sydney

Saturday: Partly cloudy. The chance of morning frost in the outer west. The chance of morning fog. Slight chance of a shower. Light winds. Min 9. Max 18.

Sunday: Partly cloudy. The chance of morning fog in the west. Slight chance of a shower. Light winds. Min 9. Max 19.

Monday: Partly cloudy. The chance of morning fog in the west. Medium chance of showers, most likely in the afternoon and evening. Light winds becoming southerly 15 to 20 km/h during the day then becoming light during the evening. Min 10. Max 17.

Melbourne

Saturday: The chance of morning fog. Areas of morning frost about the nearby hills. Mostly sunny afternoon. Light winds. Min 5. Max 15.

Sunday: Partly cloudy. Areas of morning frost. Slight chance of a shower. Light winds. Min 5. Max 14.

Monday: Partly cloudy. Slight chance of a shower. Light winds becoming southerly 15 to 20 km/h during the afternoon then becoming light during the evening. Min 6. Max 13.

The severe weather is expected to come as a low develops (massive waves in Sydney)

Brisbane

Saturday: Partly cloudy. Medium chance of showers, most likely in the morning and afternoon. Light winds. Min 13. Max 21.

Sunday: Partly cloudy. The chance of morning fog in the west. Medium chance of showers, most likely in the evening. Light winds. Min 13. Max 21.

Monday: Cloudy. High chance of showers. Light winds. Min 14. Max 19.

Perth

Saturday: Sunny. Winds easterly 15 to 20 km/h becoming light during the day then becoming easterly 15 to 20 km/h during the evening. Min 7. Max 21.

Sunday: Partly cloudy. Slight chance of a shower. Winds easterly 15 to 20 km/h turning northeasterly 15 to 25 km/h during the morning. Min 10. Max 20.

Monday: Partly cloudy. Medium chance of showers, most likely in the afternoon and evening. Winds northeasterly 15 to 25 km/h tending northerly 20 to 30 km/h during the day then becoming light during the evening. Min 12. Max 22.

Adelaide

Saturday: Mostly sunny. The chance of morning frost about the hills. Light winds. Min 6. Max 15.

Sunday: Cloudy. Medium chance of showers. Light winds. Min 6. Max 15.

Monday: Partly cloudy. The chance of morning fog about the hills. Slight chance of a shower. Light winds. Min 7. Max 15.

Some areas on the Mid North Coast, Hunter and Central Coast could see up to 300mm of rain

Hobart

Saturday: Mostly sunny day. Slight chance of a shower, most likely in the afternoon and evening. Winds northwesterly 15 to 25 km/h becoming light during the evening. Min 6. Max 15.

Sunday: Cloudy. Medium chance of showers, most likely in the morning and afternoon. Light winds becoming south to southwesterly 15 to 20 km/h during the day then becoming light during the afternoon. Min 7. Max 11.

Monday: Mostly sunny. Areas of morning frost in the north. Slight chance of a shower. Light winds. Min 2. Max 12.

Canberra

Saturday: Areas of frost and the chance of fog in the morning. Sunny afternoon. Light winds. Min -3. Max 14.

Sunday: Partly cloudy. Areas of frost and the chance of fog in the morning. Slight chance of a shower. Light winds. Min -3. Max 13.

Monday: Becoming cloudy. Areas of frost and the chance of fog in the morning. Slight chance of a shower. Light winds. Min -4. Max 13.

Darwin

Saturday: Partly cloudy. Light winds becoming southeasterly 15 to 25 km/h during the morning then becoming light during the evening. Min 22. Max 31.

Sunday: Partly cloudy. Light winds becoming southeasterly 15 to 25 km/h during the morning then becoming light during the afternoon. Min 21. Max 31.

Monday: Sunny. Winds southeasterly 15 to 20 km/h increasing to 20 to 30 km/h during the morning then becoming light during the evening. Min 21. Max 31.