“The potential is there for damaging winds again on Saturday and Sunday,” he said.
While the mercury in Sydney reached 17.2 degrees of Friday, not far shy of the August average, the wind chill meant it felt eight degrees cooler.
Similar conditions are forecast for Saturday, with the possibility of easing winds.
Come Sunday morning, though, the wind and its associated chill, will likely make conditions feel as much as five degrees cooler than the mercury suggests just as the runners gather, Mr McIntosh said.
“On the bright side, the wind is going to be at everyone’s back,” he said, with westerlies forecast to propel them towards Bondi.
“People won’t want to be out there too long – so they’ll be running as fast as they can.”
The beneficiaries of the chill from the Southern Ocean will be the ski resorts – once conditions settle.
Falls of 50-90 centimetres boosted snow depths to as much as 2 metres at some resorts in the biggest dump of the season, Weatherzone said.
Even so, the conditions would make road conditions icy, and the wind chill will be “horrendous” for those braving the slopes for the next couple of days, Mr McIntosh said.
Still, “you don’t see many bluebird days on the mountains”, so keen skiiers and snowboarders will be venturing out, he said.
The snow, though, is likely to be the only precipitation around for most of NSW. The mostly dry conditions should extend for another week, including for Sydney.
Daytime temperatures should make it back into the 20s midweek for the city, with only little winds around, Mr McIntosh said.
Peter Hannam writes on environment issues for The Sydney Morning Herald and The Age.