Deakin appears regularly across the BBC services and is one of the main weather presenters on the BBC News at Six and BBC News at One. In addition, he joined the Weather team on BBC Breakfast in January 2007 and appears regularly on Fridays and at weekends.
Deakin attended South Hunsley Secondary School on East Dale Road in North Ferriby and went on to achieve a master's degree from the University of Birmingham in Physics with Astrophysics. He is thanked in S. F. Helson and T.J. Ponman's paper "The intragroup medium in loose groups of galaxies". After university, Deakin joined the British Meteorological (Met) Office, for which he initially worked in a number of places, including York and Bristol. In 2000, he joined the team of Met Office staffers who provide weather forecasts for the BBC.
On 23 August 2003, he appeared on the BBC/Open University's television programme Star Party, which was broadcast live from Jodrell Bank Observatory. In a number of segments during the show he gave reports on the type of weather that is experienced on Mars.
Deakin is a keen recycler and in 2006 helped promote the recycling scheme of the Yorkshire town of Hessle.