Breaking: 100km/hr winds are racing up the NSW coast to Sydney.

The winds are expected to drop temperatures by 10C immediately as Sydney swelters.

Bushfires are also raging in some parts of Sydney and the winds could be dangerous for fire conditions.

BOM NSW said “there has been seeing strong north-westerly #winds gusting to about 100km/hr around #Sydney #Illawarra & several other locations. A southerly is starting to have an effect on the south coast, and will slowly build and move north over coming hours.”

Sydney bushfires flare up