Southwest Costa Rica has a tropical rainforest climate, also known as an equatorial climate.
tropical rainforest climate
A tropical rainforest climate has little to no seasonal variation and is typically hot and wet. In Tiskita, temperatures average around 82 °F (28 °C) in the day and 68 °F (20 °C) at night. Humidity is high year-round.
Tiskita receives an average of 108 inches to 156 inches (3000 to 4000 millimeters) of rain per year.
In the southwest of the country, the dry season is from December to April, when it is mostly dry and hot.
In Costa Rica, the wet months are referred to as the green season. In the southwest of the country, the green season starts around May. Until September the rain is infrequent.
In June and July, there typically is a relatively dry interval. In Latin America this dry interval in the green season is called the "Veranito de San Juan".