Global and Local Winds in Haiti

Haiti's latitude is between 18° and 20° N, with longitude roughly 72° to 74°W, placing it in the tropical zone and the Hadley atmospheric cell. The prevailing winds are the easterly and northeasterly trade winds, as shown in the map below. Haiti is roughly 10 degrees south of the horse latitudes, the zone of the subtropical highs.



I would expect that Haiti would have a tropical climate of generally warm weather with trade winds much of the time, with cool ocean breezes near the coast in the afternoons and offshore land breezes at night.  There should be mountain and valley breezes in the hills in the east of the country, bordering the Dominican Republic. Being leeward of these mountains deprives Haiti of the moisture it would otherwise enjoy, making it semi-arid.  When the intertropical convergence zone moves toward north in the summer there is unstable rising moist air with rain.

There could be times of dry stillness if the subtropical high zone moves far enough south in the winter or as cool air circulates out clockwise from the Bermuda high. The weather can become quite violent during the late summer and Fall when Haiti is vulnerable to hurricanes, some of which have done considerable damage.

http://www.weather-forecast.com/maps/Haiti?symbols=none&type=prec