La Niña typically causes an increase in rainfall in the Costa Rica's Central and Southern Pacific, and a decrease in rainfall in the southern Caribbean, according to the National Meteorological Institute (IMN).

Authorities declared an informative Green Alert nationwide.

On the Costa Rican Institute of Technology (TEC) campus, strong gusts of wind caused several trees to fall on vehicles while rains flooded classrooms, corridors, offices and parking lots.

The seventh tropical wave of the year is to blame for heavy showers over most of Costa Rica. Downpours flooded streets in San José and Heredia on Monday.

The National Emergency Commission evacuated eight families on Thursday . Mud and debris from the landslides damaged their homes, but the families are safe and healthy.

An increase in rainfall expected for August due to La Niña weather phenomenon did not occur. But meteorologists expect the rainy season to pick up soon.

Heavy rains recorded Monday morning in various regions of Costa Rica were the result of a low-pressure system, the National Meteorological Institute reported.

Motorists in Costa Rica are facing heavy traffic jams at the start of the rainy season, thanks to flooding, accidents and additional cars on the road.

Despite a strong start to the rainy season, some households in Costa Rica's Central Valley face two more weeks of water rationing while aquifers replenish.

San José officials say they have taken appropriate measures to prevent the kind of flooding that turned some city streets into lakes in recent years.