Emergency services are warning residents and tourists to avoid travelling through bushfire impacted areas due to predicted high winds.
According to the Bureau of Meteorology, Bega received 64mm and Merimbula 73mm of rain across Sunday and into Monday morning, with more predicted to fall into Thursday.
Residents have reported as much as 90mm of rain in Eden, while 40mm was recorded in Wandella, and 87mm near Bermagui.
The bureau has released a strong wind and a hazardous surf warning for the Far South Coast into Tuesday, with surf and swell conditions expected to be hazardous for coastal activities such as rock fishing, boating, and swimming.
A trough of low pressure off the coast is deepening into a low pressure system, with its main centre forming over the Tasman Sea and the secondary centre developing off the southern coast, the bureau said.
The low pressure system is forecast to stay in the region through to the mid-week, bringing windy and wet weather as well as large waves to parts of the coast as the secondary centre heads north on Tuesday.
The NSW State Emergency Service's Bega Valley branch has warned residents to avoid driving through flood prone areas, adding "trees that have been damaged by fire are likely to be more unstable and more likely to fall" in strong winds.
"The SES is advising tourists and residents to avoid non-essential travel in bushfire impacted areas on the high wind days which we are still waiting from authorities for more information on," they said on Sunday.
"There are many residents across our community on rural properties that still have fire affected trees that may become hazardous."
They are also warning residents to park vehicles under cover or away from trees, secure or put away loose items around your house, yard and balcony, and to keep at least eight metres away from fallen power lines or objects that may be energised, such as fences.
"During this extreme weather event we urge members of the public to stay away from the coastline and not to engage in risky coastal activities," Joel Wiseman from Surf Life Saving NSW said.
"If people put themselves in danger in these extreme conditions, there's a real possibility that lifesavers will not be able to save them.The forecast low pressure system will produce high winds, damaging surf with significant wave height and substantial rainfall."