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Slap On The Sunscreen, A Heatwave Is On The Way

This week will be all the proof you need that summer is finally on the way, with temperatures expected to nudge 30 degrees in capital cities around the country.

Hot air moving down from northern Australia is expected to swallow the first of the major cities as early as tomorrow.

South Australia will cop the brunt of the early heat with Adelaide forecast to reach 31 degrees on Wednesday, and a scorching 36 the following day.

The good news is, a cool change will follow bringing temperatures down into the teens ahead of the weekend.

Temperatures in Sydney's west are tipped to hit 37 degrees on Friday, while the CBD is expected to be a slightly cooler 33 degrees.

The heat in NSW is largely due to a high-pressure system sitting over the state, according to Elli Blandford, forecaster at the Bureau of Meteorology.

"It's bringing really settled conditions and allowing heat to build up," she told 10 daily, adding that a "cold front will be moving through the state on Friday and Saturday bringing warmer northwesterly winds”

It's looking hot Wednesday/Thursday/Friday. Image: Windy.com.

As the front moves on, conditions are expected to mellow out to the low to mid-twenties by Sunday.

The NSW Rural Fire Sevice has warned that the hot, dry and windy conditions could be a recipe for disaster and is urging residents to stay up to to date.

READ MORE: Woman’s Incredible Act Of Generosity To Help Fire-Ravaged Town

Around the rest of the country, Victoria, Queensland and WA will all heat up too.

The mercury in Melbourne will rise to a balmy 33 degrees by Thursday, similar conditions are expected in Brisbane on Saturday.

While Perth is expected to top 30 degrees on Saturday before cooling off ahead of the working week.

Spare a thought for Darwin residents who just sweltered through its second hottest day on record on Monday, with the mercury reaching 38.2 degrees.

Fire warnings have been issued in the Gregory and Darwin areas of the Northern Territory.