The yacht had lost power near the West Cork harbour's west pier and was in danger of drifting ashore amid Force 7 westerly winds.
The skipper of the yacht had thrown out his anchor which was holding it in position, but without power was unable to get away from the vicinity of the shore.
The alarm was raised by a another vessel, also with one on board, which was standing by but unable to assist.
Under helm Kieran Collins and crew Jerry Smith and Colin Rochford, the lifeboat immediately launched and was in scene within 15 minutes of alarm being raised.
One crew member was put on board to assist the casualty. A tow was then rigged and the yacht was towed to safety.
Also responding to the callout were Ian Lynch and Youen Jacob. Ronnie Carthy, Kieran Cotter and Colin Whooley acted as shore crew.