Millions of Aussies have awoken to grey skies and rain in New South Wales, as experts warn the worst of the wet weather is still to come.
A low-pressure system developed over South Australia on Tuesday before travelling eastward and blanketing NSW.
The heaviest rain fell in the Central Tablelands overnight on Wednesday with Mudgee and Orange receiving falls of 60mm and 53mm respectively.
Thunderstorms also accompanied by strong wind gusts of almost 90km/h.
Bureau of Meteorology Senior Meteorologist Angus Hines told Daily Mail the low-pressure system continued to be the 'main engine' for the adverse weather.
In the south of the state, severe weather warnings have been issued for the Illawarra, South Coast and Southern Tablelands on Wednesday.
Heavy rainfall is expected in the area.
A gale warning is current for the Illawarra and Batemans Coast while lesser wind warnings are in place for other stretches of the coastline.
The Byron Coast, Coffs Coast, Macquarie Coast, Hunter Coast, Sydney Coast and the Eden Coast have been put on alert for strong winds, which are expected to develop into a gale warning on Wednesday for many of the regions.
The 'complex low' over southeastern NSW is expected to move offshore by Thursday morning, with heavy rain and potential flash floods to follow.
'We're seeing a very windy few days,' Mr Hines told Daily Mail.
'It's really ramping up and will strengthen today and overnight... the system will be at its strongest when it crosses the coast overnight and tomorrow morning.
'For those coastal areas the strongest wind does depend on the makeup of the weather system, and can occur when the centre of the system gets closer.
'Those-low pressure areas can tighten up and intensify when they move away from the coast and there's nothing in their path to impede it.'
Sydney is forecast to receive damaging winds, thunderstorms and hail, with rainfall totals between 30mm and 60mm on Wednesday.
The system has also triggered a hazardous surf warning, with erratic wave sets and choppy conditions.
The wet weather will also impact Queensland and Victoria this week.
Rain will hit the north of Victoria along the Murray and parts of the northeastern ranges, while Queensland will see a band of showers, and possible isolated thunderstorms across inland regions.
The low-pressure system will hit southeast Queensland on Wednesday afternoon.
The changeable start to spring could be the beginning of a wetter-than-average season for the east.
NSW and Queensland are to expect average rainfalls over September, according to the weather service's longer-term predictions.
Regions around Sydney typically see 200 to 300mm of rainfall over spring, but this year the region could receive between 300 and 500mm.
Perth
- Thursday: Sunny. Min 7C. Max 23C.
- Friday: Mostly sunny. Min 11C. Max 26C.
- Saturday: Showers. Min 13C. Max 22C.
Adelaide
- Thursday: Shower or two. Min 9C. Max 16C.
- Friday: Partly cloudy. Min 7C. Max 16C.
- Saturday: Mostly sunny. Min 7C. Max 19C.
Melbourne
- Thursday: Showers. Min 9C. Max 15C.
- Friday: Shower or two. Min 8C. Max 17C.
- Saturday: Cloudy. Min 9C. Max 18C.
I just moved to Australia from the UK. Why do they all keep a huge weather secret from us?
Hobart
- Thursday: Cloudy. Min 5C. Max 15C.
- Friday: Partly cloudy. Min 8C. Max 16C.
- Saturday: Cloudy. Min 9C. Max 16C.
Canberra
- Thursday: Showers easing. Min 3C. Max 14C.
- Friday: Morning frost. Partly cloudy. Min 1C. Max 17C.
- Saturday: Mostly sunny. Min 1C. Max 18C.
Sydney
- Thursday: Rain easing. Min 10C. Max 17C.
- Friday: Partly cloudy. Min 10C. Max 19C.
- Saturday: Sunny. Min 10C. Max 21C.
Nationally, most regions except Western Australia are forecast to be wetter than average over Spring (above, commuters carry umbrellas in Sydney)
Brisbane
- Thursday: Sunny. Min 15C. Max 24C.
- Friday: Partly cloudy. Min 11C. Max 24C.
- Saturday: Possible shower. Min 12C. Max 23C.
Darwin
- Thursday: Shower or two. Min 23C. Max 33C.
- Friday: Mostly sunny. Min 23C. Max 35C.
- Saturday: Mostly sunny. Min 22C. Max 35C.
Alice Springs
- Thursday: Sunny. Min 5C. Max 21C.
- Friday: Sunny. Min 5C. Max 20C.
- Saturday: Sunny. Min 5C.Max22C.