|Guest appearances of Siân Lloyd|
|First appearance||17 August 1999|
|Last appearance||31 July 2001|
|Episodes with Siân Lloyd|
Siân Lloyd is a guest on Countdown, who also appeared as a contestant in Series 1 of Celebrity Countdown, losing to future presenter Des Lynam. She is a TV presenter who presented ITV Weather for 24 years from 1990–2014.
|#||Date||Type||Contestant 1||Score||Contestant 2||Presenters||Guest||Lex||Max|
|C1||23/04/1998||CC||Des Lynam||32 – 17||Siân Lloyd||Richard Whiteley||Carol Vorderman||Magnus Magnusson||Anna Eaton||59|