The Central Valley will have light to moderate rain through Thursday with the wind dying off Friday, according to the Instituto Meteorológico Nacional.
The forecast is for pilgrims who will be walking to Cartago. They need to bring rain gear, according to the forecast.
For Friday, Saturday and Sunday, the key days for the pilgrimage, there is a good chance of sudden downpours.
Pilgrims who walked to Cartago over the weekend faced wet weather, but the Fuerza Pública reports that there were few incidents. Police confiscated a knife, broke up a fight in Tres Ríos and caught a couple of participants with marijuana, they said.
This is the big week for the romería or pilgrimage to the Basilica de Nuestro Señora de los Ángeles. Police and the Cruz Roja estimate that 2.5 million people are walking to Cartago from last Thursday through Aug. 2, the feast day of the Virgin. There is a 10 a.m. Mass that day.