Costa Rica's year round climate is pleasant with naturally occurring breezes cooling down most of the coastal areas. Temperatures in the highlands and the mountains are warm by day and brisk at night, giving an "eternal spring" feeling. The average annual temperatures range from 31.7C (89F) on the coast to 16.7C (62F) inland. The rainy, or green season lasts from approximately May to December with noticeably drier days during the rest of the year. For a current forecast, check out this link: http://www.weather.com/weather/local/CSXX0009

In Guanacaste, the dry northwestern province, the dry season lasts several weeks longer than in other places. Even in the rainy season, days often start sunny, with rain falling in the afternoon and evening. On the Caribbean coast, especially south of Limon, you can count on rain year-round, although this area gets less rain in September and October than the rest of the country.

In general, the best time of year to visit weatherwise is in December and January, when everything is still green from the rains, but the sky is clear.

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