Miami, Florida (CNN) -- Former Hurricane Richard continued to weaken Monday, becoming a tropical depression, the National Hurricane Center reported.

Richard had been downgraded earlier Monday from a hurricane to a tropical storm over northwestern Guatemala as it pelted at least four Latin American nations with heavy winds and rains, the Hurricane Center reported.

At 11 a.m. ET, Richard had winds of 35 mph (55 kph) as it headed west-northwest at 8 mph (13 kph). The eye of the storm was about 145 miles (235 km) south-southeast of Campeche, Mexico, the Hurricane Center said.

Additional weakening of the storm is expected, the Hurricane Center said.

"A turn toward the northwest is expected within the next day or so," the Hurricane Center said.

The storm will emerge into the southwest Gulf of Mexico on Tuesday morning.

Rainfall amounts were expected to continue to diminish across Mexico's Yucatan Peninsula, with additional rainfall accumulations up to 1 to 2 inches expected in a few spots across the states of Quintana Roo and Campeche, the Hurricane Center said.