Costa Rica’s temperatures vary widely depending on the altitude, which ranges between sea level and 3,820 meters (12,530 feet). In the lowlands and on the coasts, the climate is hot and usually humid. In some regions, humidity reaches up to 80 to 90%. In the central highlands, there are summer-like temperatures almost all year-long, except in December when daytime temperatures can drop to 16 °C (61 ºF) In the lowlands and on the coasts, the climate is hot and usually humid. In some regions, humidity reaches up to 80 to 90%. In the central highlands, there are summer-like temperatures almost all year-long, except in December when daytime temperatures can drop to 16 °C (61 ºF). In mountain locations above 1,500 m (5,000 feet), it might get cool. In the high mountains above 2,500 m (8,200 feet), temperatures can drop to 0 °C (32 ºF) and you will be happy to have a wind jacket and a heavy sweater. As it often rains in some part of the country at any time of the year, travelling with a rain poncho or umbrella is recommended.