“The heavier rain at this stage looks to be over the Illawarra area and also further north over the northern tablelands,” said meteorologist Graeme Brittain of Weatherzone.
“This is all courtesy of an upper-level trough and a developing low-pressure system offshore which will be more apparent in the weather tomorrow.”
These consistent showers will also be accompanied by strong southwesterly winds between 25 to 40 km/h and a maximum temperature of just 16 degrees – a jarring shift from the clear and sunny conditions Sydneysiders have enjoyed this week.
“Tomorrow will feel quite cool, quite winter-like, with the wind, rain and the cloud, compared to recent days,” Mr Brittain said.
Wind gusts, too, will intensify on Friday along the coast between Newcastle and Batemans Bay, and could near as much as 80 km/h, with a hazardous surf warning issued over the coming days for most of the coastline.
“The swell will be very significant – not so much today, but Friday, Saturday and Sunday, it will be significant across the NSW coast,” Mr Brittain said.
The rain and wind will ease on Saturday, with the chance of a few showers along the coastal fringe, but with the low-pressure system set to linger in the Tasman, forecasters are unsure where the heaviest falls will land from Sunday onwards.
The mercury is not expected to hit 20 degrees again until at least Monday.