The strong squall that hit the Bay of Vlychos caused extensive damage to the region, overturning boats tied in the careenage and washing others on shore.
A 60-year-old French man was recovered from the sea and rushed to hospital, where he was pronounced dead from drowning.
The tourist had been on a boat with his wife at the time of the squall and fell overboard.
The Nydri port authority was conducting an investigation into the circumstances of the accident.
Two British tourists were also endangered in Vlychos Bay when their sailboat developed a list and took on water, but they managed to reach shore safely.