Thunderstorms and heavy rains fell in various parts of the country even on to the early morning hours. At 3 a.m. San José registered 15.5 millimeters of rain, some .61 of an inch.
The Instituto Meteorológico Nacional was predicting up to four times that amount in other parts of the country. The heaviest rains were expected on the Pacific coast.
The rain was blamed on a low pressure system in the Pacific and the approaching tropical wave or low-pressure trough.
The weather institute was predicting continued rain this morning on the Caribbean coast and in the northern zone with rain developing in the Pacific in the afternoon.