Costa Rica has one of the most diverse climates in the world making it the perfect destination for adventure seekers and nature lovers.
However, September and October is the best time to visit the Caribbean region of Costa Rica.
The best time to visit is between December and April when the climate is at its driest. The country's many great beaches are best enjoyed at this time of the year.
It’s Green Season from May to November which is the best time to explore the lush forests and also for surfing.
SOURCE: www . govisitcostarica . com/travelInfo/climate . asp
