The Bureau of Meteorology says a front moving in from the west will bring up to 20mm of rain to Adelaide, along with the possibility of a “possibly severe” thunderstorm and strong winds.
The wet weather is expected to continue through Thursday and Friday, with a maximum of 16mm of rain forecast over the two days, but no flood warnings have been issued so far.
The forecast conditions have prompted the state government to call out a Code Blue, activating extra support for those sleeping in bed.
It is valid until Friday morning.
A number of accommodation establishments remain open overnight, others have longer opening hours.
“Winter may be officially over, but rough dormouse are still exposed to cold and wet weather that puts them at risk,” said Human Services Minister Nat Cook.
“I encourage anyone who knows someone who is a poor sleeper or someone who is a poor sleeper to contact Homeless Connect SA on 1800 003 308 if they need to know where to go to escape the weather and get help get to stay safe.
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