Cold front to lash Australia's southeast ahead of weekend

Southern states are expected to be hit by fierce winds and rain as a cold front moves across the country ahead of the weekend.

Thunder, hail, cold temperatures and wind gusts of over 100km/h are set to lash Victoria, South Australia and Tasmania on Friday.

The Bureau of Meteorology issued a severe weather warning for the south-eastern part of Victoria, including Gippsland, Wimmera and parts of East Gippsland, with destructive winds including peak gusts of above 125 km/h.

The winds are expected to ease after the cold front moves through by the weekend.

The Bureau of Meteorology has issued a severe weather warning for parts of Victoria. Photo: AAP

The cold front is expected to hit South Australia first as it moves in from 5am and a severe weather warning is also in place for damaging winds in Adelaide.

The same warning is in place in Tasmania, as well as one for abnormally high tides. A potential king tide could occur in the southeast at about 6pm on Friday.

Sea levels could exceed the highest tide of the year by 30 to 40 cm.

State Emergency Services are advising people in affected areas to move their vehicles under cover or away from trees, secure or put away loose items around the house and keep clear of fallen power lines.

The cold front could also bring up to 30 millimetres of snow to alpine areas across the country.

There is also a wind warning on the Illawarra Coast, Batemans Coast and Eden Coast in NSW for Friday and Saturday.

The cold front is expected to hit South Australia first as it moves across from 5am on Friday. Photo: AAP

Sydney warm on Saturday and cool on Sunday

While the mercury is set to hit 25 degrees in Sydney on Saturday, cooler weather will arrive by Sunday with a drop to 17 as the cold front moves in.

Melbourne will reach a top temperature of 13 on Saturday and 14 on Sunday, with the same forecast tops for Adelaide.

The weather is expected to ease across the country by the end of the weekend with temperatures forecast to be warmer early next week.

Meanwhile in Brisbane a sunny weekend is expected with top temperatures of 24 on both days. Perth will have a top of 17 on Saturday and 21 on Sunday.