King got involved in radio when he was 15 years old working for pirate radio stations including Big D and Sunshine 101. He joined
98FM when it launched in 1989 where he was one of their main on-air personalities before becoming TV3's weather anchor when it launched on 20 September 1998. King also had his own Saturday morning show on
Today FM from 2002 until 2017. King's personality-driven style of weather forecasting on TV3 won King several awards and he was one of the main features of TV3's news presentation. He appeared as a guest on
The Podge and Rodge Show on
RTÉ Two in March 2006. As well as presenting weather bulletins, King has also presented a number of shows with TV3 such as ''Martin King's Commercial Breakdown
in 2008 and along with Sybil Mulcahy, co-hosted The Morning Show with Sybil & Martin'' which ran from 2009 until it was axed in 2013. King went on to co-host its replacement show called
Late Lunch Live that was also co-hosted by
Lucy Kennedy and Claire Solan. After TV3 lost the right to
Emmerdale and
Coronation Street to
UTV Ireland in 2015, King became the Monday to Thursday co-host of ''
The Seven O'Clock Show which air in the slot where Emmerdale
and Coronation Street
aired. When TV3 regained the rights to air Emmerdale
and Coronation Street
in 2016, after buying UTV Ireland, the show moved and became The Six O'Clock Show'' where King was the Monday to Thursday co-host. From 2017, King presented a daily Monday to Friday show on
Q102. In November 2022, King left the Six O'Clock Show and joined Ireland AM on the weekends. ==Personal life==