The United States has downgraded its travel advisory for Australia at the urging of Prime Minister Scott Morrison , after the US issued a warning in relation to bushfires .

Last week the US said tourists should "exercise increased caution" when travelling to Australia .

But the State Department overnight downgraded its warning to "exercise normal precautions".

NSW RFS fire fighters work through the night to prevent a flare up from crossing the Kings Highway in between Nelligen and Batemans Bay on January 2. (Kate Geraghty)

Speaking in Canberra today, Mr Morrison said he was "very pleased and appreciative" at the revision.

"I had the opportunity to raise this at very senior levels of the Administration and I particularly thank the US Administration, obviously the President but also Vice President Pence and also Secretary (of State) Pompeo for their kind attention and urgent attention," he said.

"That will be, I think, a welcome encouragement to our tourist industry, not just in the bushfire-affected areas because these things affect the tourist industry more broadly."

"Obviously the discussions I had with the US Administration was to point out the broad nature and the large-scale nature of our continent and the fact that, obviously, you can still go swimming on the reef and you can still be visiting Kakadu and still be visiting Uluru and, over in Western Australia, and in Cradle Mountain and as I was able to say, the South Coast of New South Wales is open again as well."

Australian rider Richie Porte of team BMC Racing celebrates winning stage five of the Tour Down Under from McLaren Vale to Willunga Hill, South Australia, Saturday, January 20, 2018. (AAP Image/Dan Peled) (AAP)

Mr Morrison also said the cycling event Tour Down Under was going ahead in South Australia.

"That's a strong message to the world that Australia's tourist industry is very much open for business," he said.

"The greatest experiences on the world are always on offer here in Australia."

But there is still a Level 2 advisory for US tourists visiting the ACT, the NSW Central Tablelands and southeast Victoria.

Significant rain is forecast to fall across multiple Australian states bringing much needed respite after a week of catastrophic bushfire weather conditions. (AAP)

"Visitors should exercise increased caution when considering travel to areas affected by bushfires until the risks posed by bushfires, and resulting poor air quality, have passed," the US State Department statement reads.

"Smoke from bushfires is causing poor air quality, which can increase health risks for travellers with related health conditions."

Tourism in Australia accounts for 3.1 per cent of the economy.

Nearly 400,000 Americans came to Australia for holidays in 2018, spending about $4 billion.

Only China and New Zealand sends more tourists to Australia.

Earlier this month Tourism Australia "paused" an advertising campaign on television in the UK .