Residents across the southeast of Australia should brace for a series of frosty mornings in the chilliest conditions so far this year, but Sydney is in for heavy showers over the coming days that could be supercharged by a trough of cold air moving through the upper atmosphere.
Melbourne is forecast to hit 5 degrees on Friday morning, which would make it the coldest May morning in five years and also the coldest morning in the Victorian capital since October, said Sky News Weather meteorologist Rob Sharpe.
“We’re noticing things cooling down substantially and a large high-pressure system is moving over the top,” he said.
“For southeast mainland Australia, through parts of South Australia, Victoria, the ACT and parts of NSW, it’s going to be our most widespread frosty run we’ve had so far this year.”
Adelaide is forecast for a minimum of 7 degrees for both Thursday and Friday.
“If it drops below 7.4 degrees it will be the coldest morning since October, and if it drops below 6.4 degrees it could be the coldest since September,” Mr Sharpe said.
Canberra will see “a run of chilly starts” with minimums of between 0 and 3 degrees over the next few days, which is typical for this time of year, while in Brisbane temperatures will also be within the average.
“The best chance for wet weather in Brisbane will be on Thursday and again from Monday, but the weekend looks to be dry,” Mr Sharpe said.
In Sydney, the Bureau of Meteorology tips rain on Thursday and Friday with possible showers on Saturday, but Mr Sharpe said it could be wetter than the official forecasts.
“That’s because there’s an upper-level trough moving through, that enhances wet weather and means it can be wetter than the forecasts predict,” he said.
“I wouldn’t be surprised if parts of the Sydney coastline or Central Coast pick up 30-40mm in the next 24-hour period.”
Perth is “a little bit warmer than usual” with a maximum of 26 degrees forecast for Thursday, but temperatures should drop slightly after that for a dry week.
It’s also dry season in Darwin, where a large frontal system recently brought some relief from the humidity.
“That was nice big change in the weather a few weeks ago, since then the humidity’s gone up and down a little bit depending on how the fronts have been doing in the south,” Mr Sharpe said.
Hobart is also in for “fairly calm”, dry and cold conditions over the coming days.
Watch Sky News Weather on Foxtel channel 603 or on demand at skyweather.com.au