Microclimates and packing
Understand the differences among Guanacaste, the Pacific, Central Valley, mountains, Caribbean and Northern Zone.
The essentials
Mountain ranges divide the two slopes and elevation changes temperature quickly. A national forecast is of limited use: the same day may bring sun in Guanacaste, rain in the Caribbean and cold fog at a volcano.
01
This is among the driest and hottest areas. December through March is often dry; heat intensifies and vegetation loses green colour late in the period.
Green-season afternoons commonly bring downpours. Rivers and rural roads can change after intense storms.
02
The Central Pacific combines coastal heat with very wet slopes. The South Pacific and Osa receive abundant rain and retain green forest for much of the year.
September and October are often especially wet on the Pacific side. Boats, trails and roads may change or close.
03
San José, Heredia, Alajuela and Cartago have moderate temperatures because of elevation. Green-season mornings may be sunny followed by rainy afternoons.
Conditions differ among valleys, slopes and mountain passes. December and January can be windy; a light evening layer is useful.
04
Poás, Irazú, Turrialba, Monteverde and high areas can be cold, windy or foggy while the coast is sunny. Exposure and rain lower the apparent temperature.
Carry layers, waterproofs and grippy footwear. Early arrival may improve visibility but never guarantees it. High mountains require specific preparation.
05
The Caribbean receives rain year-round, with relatively drier windows in February–March and September–October. November–January and parts of May–August can be wetter.
The Northern Zone and Sarapiquí feel Caribbean influence, with high humidity and possible rain even while Guanacaste is dry. Pack for heat, rain and air conditioning.
06
Search the specific canton or location and review hourly rain, thunderstorms, wind and advisories—not only a general icon. For mountains, ask about visibility and trail condition too.
Update plans each morning. During an alert, prioritize IMN, CNE, SINAC and local authority advice over an international weather app.
Schedules, fares, requirements, alerts and availability can change. Always confirm operational information before booking or travelling.
