Adelaide has seen its wettest 24 hours this year, according to the Bureau of Meteorology.
A BOM spokesperson said the city had received more than 46 millimetres overnight, with the Adelaide Hills town of Woodside recording 80mm of rain and Ashton recording more than 70mm.
Strong winds also caused havoc, with gusts of 102 kilometres per hour felt in Noarlunga and more than 90kph in the Kuitpo forest.
Emergency services received more than 350 calls overnight.
At Burnside, the SES is trying to clean up the flooded car park.
There are currently 90 outstanding SES jobs as wet weather continues.
Margaret Thomson spent the morning trying to salvage items at a friend's property at Linden Park she is looking after.
"The rain has just been torrential, it hasn't stopped all night," she said.
"When I came to check, water had completely flooded the courtyard."
She said she had been trying to clear water but the drains were not large enough.
"Hopefully the SES can get here soon, I understand they're incredibly busy.
"Then I'll be able to sandbag and try to stop the flooding."
Wild wind damages
Despite not being hit with as much rain, regional areas suffered strong gusty winds.
In Gladstone, the Golf Club's roof blew off.
Treasurer Dennis Webster said clean-ups were underway.
"We are checking what's damaged inside," he said.
"We are trying to clean up what's left, the SES are here trying to strap down the other half of the room.
Mr Webster said many trees were down across the town.
"It was really big winds but not as much rain," he said.
SES officer Brenton Clarke urged people to ensure their homes were secure, with more wet and windy conditions predicted.
"It's important that people be vigilant making sure properties are clear of any debris, drains and gutters are clean and any areas where there's loose items," Mr Clarke said.
"Fences or some roofs that do need repairing, that people do attend to those.
"Particularly some tree down events where they're able to actually see branches or trees that have come down onto roads.
"Today, we're anticipating more calls along those events plus additional calls as this rain does persist throughout the day and over the next."
