Weatherley was born in London on 1 March 1939. He moved to Canada in 1956 for a military career, serving five years in the Canadian Army. Weatherley eventually moved to New Zealand in the early 1960s, starting acting in New Zealand in 1965 in amateur theatre and branched out to do radio drama and commercials. He turned professional about 1966. His first show was “Oh What A Lovely War” with Downstage. Then he did a couple of national tours. He worked with the Dunedin, Southern Players, joined the Central Theatre, and then the Mercury Company. In 1970 he appeared at Expo 70 in Japan.

He was perhaps best known outside New Zealand for his series regular role as Spencer in Power Rangers Operation Overdrive, which was filmed in New Zealand.