Get ready for a very wet start to the working week.
Showers in Wollongong on Monday morning are expected to increase to rain, possibly heavy, during the afternoon.
There’s also the chance of a thunderstorm later in the day.
Elsewhere, the Bureau of Meteorology has issued a severe weather warning for heavy rainfall and abnormally high tides across parts of the Illawarra and the South Coast.
The alert – for an area spanning from Nowra to Narooma – has been prompted by a deepening trough near the NSW coast.
The coastal trough is expected to bring periods of heavy rain to the southern NSW coast on Monday and Tuesday.
“Rainfall may be enhanced on a local scale by the development of small low pressure circulations within the trough, and thunderstorm activity,” the bureau said.
Heavy rain, which may lead to flash flooding is possible in coastal areas between Nowra and Narooma from Monday afternoon until Tuesday afternoon.
Locations which may be affected include Batemans Bay, Moruya Heads, Huskisson and Ulladulla.
“24 hour rain totals in excess of 100mm are likely, with the bulk of this forecast to fall at night,” the bureau said.
“Water levels could reach or exceed the highest tide of the year during high tide tonight [Monday] and on Tuesday morning.”
High tide is expected between 9pm and 10pm on Monday and then between 9am and 10am on Tuesday.
At this stage, Wollongong had not been included in the severe weather warning.
However, the bureau said Wollongong could be drenched by between 20 and 30 millimetres of rain on Monday.
Further falls of up to 30mm are forecast in the city on Tuesday.
An updated severe weather warning is expected to be issued by 5pm.