Winter winds to blast NSW

The first days of winter in NSW will bring "vigorous" southerly winds, forecasters say.

The mountains at Thredbo have this week received dustings of snow with freezing temperatures and staff say snow guns have been put to work one week out from the opening of the ski season.

Perisher, which also opens on Saturday June 9, has also experienced snowfall and is preparing to put a new quad chairlift into action for the first time.

The Bureau of Meteorology on Thursday issued a severe weather warning for damaging surf and abnormally high tides along the state's Central Coast.

Forecasters warned of "vigorous southerly winds" and "large and powerful waves" as a low pressure system deepens over the Tasman Sea.

The bureau's climate outlook for winter has predicted a mild and dry season, with a more than 75 per cent chance of below-average rainfall in NSW.

Climatologist Jonathan Pollock said the NSW autumn was likely to be ranked as one of the 10 driest on record.