A FORMER US TV weatherman will lead an Australia-wide speaking tour on the theme that "the climate scares are false".

Anthony Watts, who runs a blog arguing that humans aren't damaging the climate, will speak in 18 cities and towns from Sunday.

Climate sceptics have gained traction after the failure of the Copenhagen climate conference and debate about the accuracy of UN climate science.

A political lobby group, calling itself The Climate Sceptics, has organised the tour which includes Sydney, Melbourne, Perth, Brisbane and Canberra.