Much of the country faces a day of thunderstorms and downpours, the Instituto Meteorológico Nacional said Thursday.
The weather institute blamed humidity coming in from the Pacific and said there would be downpours in all regions except the northern zone, the north Pacific and the Caribbean coast.
There were storms early today which were accompanied by lightning.
Some 125,000 strikes of lightning have been counted so far this year.
The rains today are expected to extend into the evening.