Windy, wet weather on the way today

"There is a risk of damaging winds across a broad area of the state, roughly south of Streaky Bay to Port Pirie to Renmark - this includes the Adelaide metropolitan area," Bureau of Meteorology senior forecaster Matt Bass said.

"We are urging people in those areas, particular those taking advantage of school holidays and are not familiar with the region they're visiting, to be aware that driving conditions and some outdoor activities may be hazardous."

State Emergency Services chief of staff Trevor Arnold warned the public to be aware of fallen trees or debris on the road and keep clear of fallen powerlines.

The winds are a result of a strong cold front sweeping across SA, bringing with it bursts of heavy rain.

"The heaviest rainfall and strongest winds for Adelaide are likely to be from mid-afternoon today through to the evening, including the afternoon commute, so drive to the conditions and stay safe," Mr Bass said.

Mr Arnold said the weather could cause minor street flooding.

"We're urging motorists to not drive, ride or walk through floodwater and keep clear of creeks and storm drains. And also check your gutters," he said.

Mount Lofty Ranges, parts of lower South East and Kangaroo Island are expected to receive 15-30mm of rain, with isolated heavier falls possible.

Windy, wet and wintery conditions are expected to persist across the south of SA through to the end of the week, with another front expected on Friday.

There will also be rough, hazardous conditions on coast.

"If you're along the coast or considering water activities, please check our warning and monitor the conditions as we're expecting significant wave heights of more than 5 metres along exposed southern coasts to develop Wednesday, persisting Thursday and increasing 6-8m on Friday," Mr Bass said.

"If you're visiting the coast, make sure you observe safety signage and stay well back from the wave zone and for boaties, re-consider activities on the water," Mr Arnold said.