Australia Weather News

Parts of South Australia experienced significant frost this morning. - ABC

Parts of South Australia have shivered through icy temperatures overnight, with one south-east town recording its coldest minimum on record.

The Bureau of Meteorology (BOM) said "extremely cold temperatures were recorded at various locations", and is forecasting more frost, rain and possible light snow in parts of the state as the week continues.

Keith, in the state's south-east, dipped to -4.7 degrees Celsius just before 5:15am — a record low for the town.

"The previous coldest day was -4.4C on June 15, 2006," BOM senior forecaster Tom Boeck said.

"That particular station, that site at Keith, has been operational since July 2001."

Mr Boeck said the temperature was also lower than any recorded at a second BOM site at Keith, which was opened in 1962.

It was even colder in Yunta, 275 kilometres north-east of Adelaide, which recorded -5.0C just before 6:45am.

Renmark and Loxton had overnight lows of -4.6C, and Snowtown recorded -4.1C.

Adelaide's CBD also recorded a minimum of 0.8C at the West Terrace-Ngayirdapira weather station, with "significant frost areas" visible in the parklands this morning.

'Very light snowfall', high rainfall forecast

Mr Boeck pointed to "significant cold outbreaks" moving through Tasmania and Victoria in recent days as the source of South Australia's cold snap, which he described as "one of those things that probably happens only once every few years".

"There have been photos and videos circulated of snowfall to relatively low levels over Tasmania in the last 24 to 48 hours," he said.

"We didn't get that snowfall in South Australia, but we're on the tail end of that cold air and we have had clear skies and light winds move overnight associated with a weak high pressure ridge.

"Those sorts of conditions are conducive to cold overnight temperatures."

The BOM said South Australians can expect colder daytime temperatures later this week, with possible "very light snowfall" in the Flinders Ranges and Mid North.

"Cold to very cold temperatures [are] expected on Thursday and Friday during the day," Mr Boeck said.

"The higher ground of the Mid North and the Flinders and the Mount Lofty Ranges — some of those temperatures are certainly going to struggle to get above 10C for maximum temperatures during the day.

"There is a chance that later on Thursday and particularly on Friday, of some light falls being possible on the higher ground of the Mid North and Flinders Ranges areas. I don't think there will be a lot, but it is a possibility."

Adelaide is expected to reach just 10C or 11C on Friday, while centres in the Mid North may only reach 5C or 6C.

But the BOM expects overnight temperatures will not be as cold as they have been, with more cloud moving over the state.

A severe thunderstorm warning for damaging winds is current in part of the SA's far north, with the state preparing for its highest levels of rainfall in months.

The cold front is tipped to bring widespread rainfall of up to 25 millimetres over remote pastoral districts, with thunderstorms potentially pushing totals up to 50mm in some areas.

BOM senior forecaster Mark Anolak said July had been "one of the driest periods across South Australia … since 1997".

"This rainfall event will produce good rainfall across much of the areas which are very deficient in rainfall so far," he said.