Sean Hurley, 25, a brother of RTÉ sports broadcaster Jacqui Hurley, was driving a 4x4 when it hit a ditch between Halfway and Kinsale at 6pm.
Mr Hurley, a highly regarded and well-liked track racer, was a past pupil of St Brogan’s College in Bandon.
Last night his fellow motorbike enthusiasts took to the internet to pay tribute to his memory.
Television comedian PJ Gallagher described Mr Hurley as “one of the nicest men in motorbikes”. Until yesterday Mr Hurley’s own Facebook page had been dedicated to the Italian superbike racer Marco Simoncelli, who was killed while racing in October.
Sean Hurley was the second man in less than five hours to die on the county’s roads.
Earlier in the day Denis Bennett, 64, from Blarney Street in Cork was killed when the car he was driving hit a truck on the main road between Macroom and Ballyvourney. The truck driver was uninjured.
It is not known whether the desperate weather conditions in the south contributed to the accidents.
Throughout the evening gale force winds, hailstones, thunder and lightning made roads treacherous.