On Wednesday, temperatures peaked at 12.4 degrees, with the highest daytime temperature only reaching 11.6 degrees, making it the coldest day in over a year.

“The bulk of the rain still lies ahead of us,” Hines said.

“The rain observed in recent days across eastern Australia is set to significantly increase as a low-pressure system forms off the east coast ahead of the weekend.”

While the weather system will mostly impact NSW.

“The low-pressure area will be over the water, it’ll have a significant impact for weather in NSW.

“Rain will become heavier, wind will become stronger, and the seas will be more powerful.”

Rain will start to intensify over the weekend, with about 20mm expected today and another 50mm expected tomorrow across NSW.

While there are no severe weather warnings yet, however, there’s a strong possibility the bureau will issue some later today.

“Saturday, this weather system will really make its presence felt. The wind, rain and surf will intensify,” Hines said.

“The Hunter Region and Mid North Coast district will see severe weather.”

Between 50mm to 100mm of widespread rain is expected between Port Macquarie and Sydney, down to the South Coast and Illawarra. 

Some flash flooding is possible around river catchments north of Sydney. 

Damaging winds and surf are also expected over the weekend.

The weather system is expected to clear by Sunday afternoon, with “clearer” and “warmer” weather forecast for Monday. 

Queensland has seen about 20mm of rain overnight, with some wet weather expected in the northern tropics.