Siân Lloyd is a Welsh television presenter and meteorologist. She is the United Kingdom's longest-serving female weather forecaster, having appeared on ITV Weather for 24 years, from 1990 until 2014. She won the Television and Radio Industries Club (TRIC) award for the best TV weather presenter in 2005 and 2007. For a time, she additionally presented ITV News London weather forecasts. In February 2014 she left ITV to pursue new opportunities.
She has meteorology qualifications from the Met Office College, and frequently appears in TV documentaries about the weather.