U.S. weather forecasters say Hurricane Hilary has slightly weakened as it swirls off Mexico's Pacific coast. The storm is expected to gradually lose power over the next two days.

The National Hurricane Center said Tuesday that Hilary had weakened from a category 4 to a category 3 storm on the five-point scale of hurricane intensity, with winds of 185 kilometers per hour.

The storm is not expected to make landfall, and no coastal watches or warnings are in effect.

However, forecasters warn that swells generated by the hurricane are affecting portions of the southwestern coast of Mexico and its southern Baja California region. Forecasters say these swells are likely causing life-threatening surf and rip current conditions.

Elsewhere, the hurricane center is monitoring Tropical Storm Philippe as it churns in the Atlantic. Philippe is well more than 1,000 kilometers west of the Cape Verde Islands and has top winds of 85 kilometer-per-hour. No coastal watches or warnings have been posted and no significant change in strength is anticipated in the next two days.