Heatwave to batter South Australia for a week

A severe heatwave is set to sweep South Australia in coming days, with residents warned to prepare.

It has been a relatively mild start to summer in the state but temperatures in Adelaide are set to top 30C by tomorrow.

And they aren't expected to drop anytime soon, with the heat forecast to stay there for the next six days.

Temperatures of 37C are predicted for Monday.

The SES is concerned about falling trees, and emergency services are all on high alert.

Authorities have reminded people their time outside should be limited.

SES spokesperson Ian Bonython said people should endeavour to only go outdoors in the mornings and the evening, and not leave pets or children unattended.

"If you've got elderly family friends that are, especially, living at home by themselves, keep in regular contact with them," he said.

A cool change is not expected until next Thursday.