A low-pressure system is now off the Caribbean coast of Nicaragua is the reason for all the rain.
The U.S. National Hurricane Center said that the system is disorganized but still has a 40 percent chance of becoming a cyclone.
The Instituto Meteorológico Nacional in San José said the system is far from the country but still is having an effect. The system is drawing moisture from the Pacific into the national territory and generating moderate to strong rain, mainly in the afternoons.
The Central Valley saw rains from early Sunday through the evening. Emergency officials continue to warn about flooding rivers and possible landslides. The Interamericana Sur has been closed between Palmar Norte and Buenos Aires de Puntarenas due to slides, and motorists headed that way have the option of checking with the Policía de Tránsito on conditions.
A stretch between Sarchí and Bajos del Toro also has seen a slide, officials said. They said the route may be closed.
The prediction for today is possible thunderstorms in most sections of the country in the afternoon
The wet weather already has caused deaths. Five persons died in Peralta de Grecia about 4:20 a.m. Friday when a tanker truck skidded on wet pavement and smashed the side of a small bus headed in the opposite direction. Five persons of the 10 in the bus, including the 18-year-old driver, died from the crash. They were on their way to work.
In the Hospital de Pérez Zeledón Friday a fourth victim from a Wednesday accident died. He was identified by the last name of Ureña. That crash also happened at night when a vehicle seemed to go out of control and hit two other vehicles.
Three persons in the car died at the scene. Ureña was hospitalized.