There is no single “best month.” The Pacific and Central Valley have more distinct seasons, while the Caribbean follows a different pattern. Your best window depends on the route and how you balance dry weather, moderate prices and fewer visitors.
December–April: generally dry on the Pacific and in the Central Valley.
May–November: green season, with frequent rain and lush landscapes.
Caribbean: February–March and September–October tend to be relatively drier.
Easter, year-end holidays and school breaks require earlier booking.
01
December to April: more sun, more demand
Much of the Pacific, Guanacaste and the Central Valley sees predominantly sunny, dry mornings. This is convenient for rural roads, beaches and hiking, but demand is high.
Dry areas may look golden and dusty by March and April. Mountains and volcanoes can still bring wind, fog and abrupt weather changes.
Book accommodation, vehicles and popular parks early.
Compare flexible dates: Christmas, New Year and Easter drive occupancy.
Sun protection and hydration matter even at elevation.
02
May to November: the green season
On the Pacific and in the Central Valley, usable mornings followed by afternoon downpours are common, but not guaranteed. September and October are often particularly wet on the Pacific.
Rain reduces dust, fills rivers and transforms the landscape. It can also cause floods, mud, landslides and temporary closures, so build slack into your route.
Schedule hikes and transfers early.
Carry a waterproof bag and quick-drying footwear.
Never cross swollen rivers or ignore official closures.
03
The Caribbean follows its own calendar
The Caribbean side has no clearly defined dry season. Coastal areas tend to have relatively drier periods in February–March and September–October.
Tortuguero, Puerto Viejo, Cahuita and Caribbean mountain areas can be rainy while the Pacific is dry. Check the exact regional forecast, not a single “Costa Rica” forecast.
04
Wildlife and seasonal experiences
Natural seasons vary by species and location. Turtle nesting, whale watching and bird migration each have different windows, and sightings are never guaranteed.
Choose responsible operators, keep the required distance and confirm protected-area rules. Never touch, feed or block wildlife for a photograph.
05
A practical decision method
Choose two or three regions first, then compare rainfall, road time and your main activity. Finally check occupancy and cancellation terms.
If your route depends on demanding trails, boats or domestic flights, include a flexible day. A short trip generally works better on one side of the country.
Sun priority: Pacific, January–March.
Green landscapes and lower demand: May–June or November, accepting rain.
Caribbean priority: consider February–March or September–October.
Wildlife priority: choose the species first and consult an official site or accredited operator.
