Mid North Coast State Emergency Service (SES) crews were called out to around 15 jobs in the coastal strip stretching from north of Port Macquarie to the Great Lakes last night.
The main problems were roof damage and flash flooding, in the Forster area from a very heavy downpour.
SES regional spokesman Steve Lawrence said severe thunderstorms are forecast for the region again today.
"Again we're putting out there for people not to enter floodwater and to make sure they also do not enter any swollen creeks or drains," he said.
"Particularly letting little children play in those types of areas.
"So they are the main messages we're trying to bring home today."
Alternating traffic conditions are also in place on the Lakes Way at Forster after the heavy overnight rain led to flash-flooding.
The road has water across it about 2 kilometres from the Forster Keys Estate, near the turn-off to Seven Mile Beach.
The Transport Management Centre says motorists need to exercise caution, drive to conditions and allow extra travel time as there is heavy traffic in the area.
© ABC 2013