Wild Weather Ahead: Soaring Temps, Fire Bans, Snow And A Cold Front

Soaring temperatures, fire danger and even snow.

The mercury tipped 30 degrees Celsius in Sydney by midday on Saturday, with above-average temperatures and dry and windy conditions extending across the north and east of the state.

But temperatures are expected to drop significantly as a strong cold front passes through this afternoon.

Many Sydneysiders are hitting the beach. Image: AAP

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A total fire ban has been declared in the Greater Sydney region, among others including the Illawarra and the state's northwest -- all of which have "severe" fire danger ratings.

The bans restrict the lighting, maintenance or use of open fires, solid fuel BBQs powered by coal, wood or heat beads and outdoor activities such as welding. All fire permits are also suspended until declared bans are lifted.

The weather bureau forecasts a strong cold front will hit much of eastern New South Wales on Saturday afternoon and into the evening, dropping temperatures below 20 degrees in some areas.

"Vigorous" winds are set to hit Thredbo, Wollongong and Goulburn, with snow expected in the southern ranges above 700 metres on Sunday.

Victoria currently has a Severe Thunderstorm Warning for the North Central and parts of Central and Northern Country Forecast Districts.

The BOM also has warned of damaging winds in South Australia. The warning is for people in Adelaide Metropolitan, Mount Lofty Ranges, Kangaroo Island, Upper South East, Lower South East and parts of Mid North and Murraylands districts.

The winds are averaging 50-65 km/h about coastal areas and higher ground of the ranges within the warning area. Damaging wind gusts generally in the range 90-100 km/h may occur over parts of the warning area, most likely with squally showers and isolated thunderstorms.