The man, in his 20s, was pulled from Lough Ree in the Irish midlands after the boat he was in with two other Northern Ireland men capsized yesterday afternoon.
One of the men remains in a critical condition in hospital while another is still missing.
Damien Delaney, RNLI operations manager at Lough Ree said: "We'll go back to the search area again, where we left off yesterday evening, start again at View Point, we'll be assisted by people from Athlone Sub Aqua and Lanesborough Sub Aqua and some local anglers."
"There was quite a long trail of debris leading right across the lake for a distance of about two miles, so we'll be following that trail area today," he said.
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