On Saturday, between 10-15mm of rain is expected with some areas possibly receiving more.

Bureau of Meteorology senior forecaster Jake Phillips said there was a slight risk of a thunderstorm for Friday but Saturday is when to expect the full force of the weather.

"We've got a weather system moving through which looks like it is going to bring widespread rain and thunderstorms as well," he said.

"Saturday could be a fairly wet day, our computer models are a bit varied, but perhaps 10-15mm and locally it could be more than that depending on where the thunderstorms develop.

"On Sunday we're looking at some more showers, but no thunderstorms and a significantly cooler day - on Saturday night a southerly change will come through and cool things off for Sunday."

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On Saturday in Nowra, it is forecast to hit 29 degrees but on Sunday top temperatures will drop down to around 16. Ulladulla will see a maximum of 23 on Saturday and 15 on Sunday.

The Bureau of Meteorology asked the public to keep their eye out for any severe thunderstorm warnings which may be issued for Saturday.

A marine wind warning for strong wind along the South Coast and Illawarra has been issued for Friday, October 23.

"The second half of Friday is looking pretty windy," Mr Phillips said.

"It's likely we'll have the marine wind warning continuing through to Saturday as well.

"So a few windy days out on the water."