Lifeguard patrols will start at Southbourne, Fishermans Walk, Boscombe and Bournemouth East and West, Durley Chine, Alum Chine, Branksome Chine, Shore Road and Sandbanks in Poole.
Redknapp spent most of his playing career with West Ham and Bournemouth and went on to manage both clubs before taking charge of Portsmouth in 2002, guiding the club into the Premier League within 14 months as First Division champions.