Hurricane Hernan reached Category 3 strength far out to sea on Saturday, becoming the first major hurricane of the eastern Pacific season, the AP reported.
The U.S. National Hurricane Center in Miami said Hernan was beginning to weaken and its wind strength had dropped slightly to 115 mph (185 kph) late Sunday.
The center said the fifth hurricane of the season poses no threat to land.
It was located far off Mexico's western coast, about 1,065 miles ( 1,715 kilometers) west-southwest of the tip of the Baja California peninsula, and moving further out to sea.
Storms are classified as hurricanes with winds of 74 mph (119 kph) or more, and are rated on the five-category Saffir-Simpson hurricane scale.