Two other active storms intensified into hurricanes, and Nate could pass near Bermuda by Thursday, forecasters said.
Nate, with sustained winds of 85 mph, was centered about 215 miles south-southwest of the island and was drifting north-northeast. It was not expected to threaten the United States.
Hurricane Maria, which earlier was downgraded to a tropical storm, still had winds of 80 mph, according to new observations. It was moving northeast near 14 mph toward colder waters.
Nate is the sixth hurricane in a busy Atlantic hurricane season. The season began June 1 and ends Nov. 30. Peak storm activity typically occurs from the end of August through mid-September.