Born in Carmarthen, Carmarthenshire, Wales, he moved to Swansea until, aged 15, he went to live with his aunt in Liverpool, just as the Merseybeat scene exploded.

[1] In 1966 Weathers joined a Neath band The Eyes of Blue, along with Phil Ryan (keyboards) and Gary Pickford-Hopkins (vocals) from The Smokestacks.

Whilst with Gentle Giant, Weathers occasionally played with Phil Ryan's band The Neutrons, including their 1974 album, Black Hole Star.

After Gentle Giant disbanded in 1980, Weathers played a number of temporary positions, until he joined the psychedelic/progressive rock band Man when they reformed in 1983.

Weathers was variously reported to have been suffering from RSI or arthritis, but according to him was actually "diagnosed with a condition called Spinocerebellar ataxia, which is akin to M.S"..[3] The unpublished memoirs of his time spent in Morriston Hospital – Two Weeks in Pain – Under the Knife, document the trials of an NHS in-patient in post-op recovery.

Weathers has appeared on several Welsh TV soundtracks, and in 2006 rejoined Wild Turkey, to record their album You & Me in the Jungle and tour Europe.