Sydney could hit 30 degrees on Thursday with warmer conditions expected across NSW as strong and gusty winds are also expected in parts of the state and the ACT this week.
The Bureau of Meterology issued a severe weather warning for damaging winds on Wednesday in parts of the south west slopes, the Snowy Mountains and Canberra.
However, warmer conditions are coming to NSW on Thursday, including 29-30 degrees in Sydney.
"The warmth of spring is coming, but so are some gusty winds," the bureau tweeted on Wednesday.
"Already today Bourke & Wilcannia have hit 30 degrees and tomorrow it could be Sydney's turn. Keep an eye on our wind warnings, dust and warm conditions in NSW/ACT," it said.
Strong northwesterly winds are hitting parts of NSW and the ACT on Wednesday, mostly in the Snowy Mountains region with wind gusts in Thredbo reaching 117km/h.
The winds should ease overnight and return across southeastern NSW on Thursday.
There's an increased risk of trees coming down in areas previously impacted by fires or recent rain and raised dust is starting to move across parts of far western NSW