Education
Born and raised on a farm in Neuaddlwyd, Aberaeron, she was educated at Ysgol Uwchradd Aberaeron.
Born and raised on a farm in Neuaddlwyd, Aberaeron, she was educated at Ysgol Uwchradd Aberaeron.
After training and working as a singer and part-time presenter of children"s television programmes, she started reading Welsh at Cardiff University. She then took a two years break in order to present children"s sports programme Cracabant before finishing her degree at Cardiff University. Having played rugby union at both universities, and captained Cardiff Ladies for a year, she joined the sports department of British Broadcasting Corporation Radio Cymru in 1995, becoming the first woman to report on rugby for the station.
After graduation she worked as a television producer with production company Apollo, on programmes such as Noc Noc, Cân i Gymru (Song for Wales) and Dudley.
She returned to sports in 1997 as a sub-producer and presenter on Y Clwb Rygbi (The Rugby Club). She then introduced various series, including Seven a Side Rugby World Games, Irish Rugby, World Championship netball and roller-hockey World Championships.
During this period she also presented Saturday afternoon sports programme Camp Lawn (Grand Slam) with Dylan Ebenezer on British Broadcasting Corporation Radio Cymru. This led to production and presentation work on Sky Sports on its darts and pool coverage.
Siôn then presented a number of non-sports programmes on S4C, including talent programme Wawffactor, S4C"s coverage of Eisteddfod yr Urdd and presented Y Briodas Fawr (The Big Wedding) with Rhodri Owen.
After becoming part of the posse on Jonathan Davies S4C Friday evening show Jonathan, she presented her own chat-show Cadair Fawr Eleri Sion (Eleri Sion"s Big Chair). She also presented quiz show 100 o Blant (A Hundred Children) produced by Tinopolis in 2013 and was a prenter on nightly magazine show Heno (Tonight) for the same production company for a period in 2012/13. Since mid-October 2013, Siôn has presented the Monday-Thursday daily afternoon radio show on British Broadcasting Corporation Radio Wales, replacing Louise Elliott.