A man has been rescued after he drove through a flooded creek at Valley View in Adelaide's north.

Emergency crews arrived to find the man on the roof of his car.

Rabia Nassereddine, 23, said he was driving to work at 6:00am when his BMW got stuck in water flowing across Pauls Drive.

He said his rescuers threw him a rope to put around his waist and he was winched to safety with little more than a bruised ego.

There has been heavy rain across a wide area of South Australia.

More than 70 millimetres has been recorded at Mount Crawford and up to 65mm in some northern suburbs of Adelaide.

Yorke Peninsula, the mid-north and far north have also reported heavy falls.

Warnings of flash flooding have been issued for the Flinders and North-East Pastoral districts.

More rain and thunderstorms are forecast in areas including Leigh Creek, Marree and Arkaroola.

Adelaide has exceeded its March average rainfall of 25mm, with much of the month remaining.

Emergency services have responded to hundreds of calls for help due to localised flooding across the northern suburbs, Gawler and the state's mid north.

Rain is a threat to harvest time for Barossa and Clare Valley grape growers.

The vice-chairman of the Clare Grapegrowers Association, Anthony Koerner, says splitting of grapes and disease could be serious threats.

"It depends on how much we get but we are probably at a critical stage - the whites in particular so far as risks of splitting goes, I think if we get probably 10 to 20 millimetres we will probably be OK but anything above that I think we'll have some problems," he said.