Tropical storm Bonnie is expected to intensify into a Category 1 hurricane off the southwest coast of Mexico on Sunday evening, packing winds of up to 153kmh, Mexico's national meteorological service said.
Bonnie made landfall on Friday evening on the Caribbean coast near the Nicaragua-Costa Rica border, bringing heavy rains across the region, before crossing over to the Pacific on Saturday.
Local media reported one death in El Salvador due to the storm.
The hurricane may reach Category 2 classification on Monday night with winds of up to 177kmh before moving away from Mexico on Wednesday, according to the meteorological service.
The service warned that the forecasted hurricane could result in intense rains, mudslides, floods, strong wind gusts and ocean waves up to 5 metres along the country's southern Pacific coast.