Dominical. and surrounding villages sit right on the water's edge, and rainfall is about the same as in other coastal towns to the north or the south. Logically, Dominical's climate should also be similar: hot days and warm evenings. But this is not the case. Mornings and evenings are much cooler, and even during the middle of the day pleasant breezes come in from across the ocean. At night temperatures drop into a delightful range, making it possible to sleep without an air conditioner.
Don't misunderstand, the climate here isn't like the Meseta Central, but it is considerably cooler than most parts of the coast. This is due to an odd juxtaposition of geographical features. Not far from the beach, mountain slopes start climbing sharply from the flat shelf of land that borders the ocean. They swoop higher and higher until they reach Costa Rica's highest point- Chirripo peak. During daylight hours, the sun beats down on that narrow strip of land between the ocean and the mountain slopes, heating the air, causing it to rise. As the warm air flows upward along the mountain's face, cooler air is continually pulled in from the ocean. Then in the evening, when the sun's heating action stops, cool air from the high peaks descends (cool being heavier than warm), reversing the direction of the breeze, pushing the humid, muggy air out to sea.

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