Costa Rica Climate Go Home Happy, or Don't Go Home.
Temperatures vary more by region and elevation than by season.
The average temperature on the Caribbean coast is 83 F, and the Pacific coast is only slightly warmer, whereas the temperature in San Jos is usually in the mid-seventies. The warmest spot in the country is in the region of Guanacaste around the province's capitol of Liberia. There the highs are in the nineties year round, though temperatures are much cooler at night. When making travel plans, we recommend seriously considering the green season. All rights reserved.