Costa Rica weather seasons do not follow a simple summer and winter pattern. Instead, Costa Rica has a dry season and a green season, with the green season's rain bringing the landscapes to life rather than ruining a holiday. This guide to Costa Rica weather seasons explains the two seasons, how the Pacific and Caribbean coasts differ, why microclimates matter, and how to choose the best time for beaches, wildlife, surfing and adventure.
Costa Rica is small but climatically diverse, with Pacific beaches, Caribbean shores, central mountains, cloud forests and dry northwestern plains all within a few hours' drive. Temperatures stay warm year-round in lowlands, cooler in mountains, and rain timing varies by coast and altitude. Understanding Costa Rica weather seasons therefore means checking the forecast for each region you visit, not just a national average, and packing for rain as well as sun in every season.
Costa Rica Weather Seasons: Dry Season December to April
Costa Rica weather seasons in the dry season, roughly December to April, bring the most sunshine, especially on the Pacific side, where Guanacaste and the Nicoya Peninsula enjoy long dry spells, dusty roads and golden sunsets. Pacific beaches are at their best for swimming, surfing and boat trips, with calmer seas and clearer skies, while the Central Valley, including San José, enjoys warm days and cooler nights. Dry season is peak tourist season, with higher prices, larger crowds and early booking needs, especially around Christmas, New Year and Easter.
Dry season also brings trade winds to Guanacaste, which can make beaches breezy and kite surfing excellent, while the Caribbean side remains wetter than the Pacific, with rain showers possible even in dry months. Central mountain cloud forests, such as Monteverde, are misty year-round, though dry season offers clearer views and drier trails. For Costa Rica weather seasons planning, dry season suits first-time visitors who want reliable beach weather and easy road travel, accepting higher costs for that reliability.
Costa Rica Weather Seasons: Green Season May to November
Costa Rica weather seasons in the green season, roughly May to November, bring afternoon rain, lush landscapes, lower prices and fewer tourists. Rain typically falls in the afternoon or evening, leaving mornings sunny for hiking, wildlife watching, surfing and beach time if you start early. Rivers flow strongly, waterfalls are at their most impressive, and wildlife, including frogs, birds and sea turtles in season, is more active. Green season is also prime surfing season on the Pacific coast, where swells are stronger and beaches less crowded.
Green season challenges include muddy trails, occasional road flooding, rougher seas and transport delays during heavy storms. September and October are usually the wettest months on the Pacific side, while the Caribbean side often has a drier, sunnier window in September and October, making it a good alternative when the Pacific is wettest. Pack a quality rain jacket, waterproof bags, quick-dry clothes and sturdy shoes, and keep indoor alternatives for afternoons. With early starts, green season Costa Rica is often more rewarding than peak season.
Costa Rica Weather Seasons: Pacific Versus Caribbean
Costa Rica weather seasons differ most between coasts. The Pacific coast, including Guanacaste, Puntarenas and the Osa Peninsula, has a clear dry season and a wet green season, with the driest months in the northwest and wetter conditions further south. The Caribbean coast, including Limón, Puerto Viejo and Tortuguero, is wetter year-round, with no true dry season, though February to April and September to October tend to be relatively drier and sunnier. That contrast means a trip combining both coasts needs separate forecasts for each side.
Microclimates add further variation. The Central Valley is mild and spring-like, Monteverde cloud forest is cool and misty, Arenal's volcano area is warm and humid with rain possible any month, and high mountains such as Cerro Chirripó can be cold at night. Altitude, more than latitude, determines temperature in Costa Rica, so a drive from San José to a Pacific beach can cross several climates in hours. Check forecasts for each town, not just the nearest city, and pack layers for mountain stops even on beach trips.
Costa Rica Weather Seasons: Wildlife, Surfing and Activities by Season
Costa Rica weather seasons shape wildlife experiences. Sea turtle nesting on the Pacific side peaks in different months by beach, with Ostional's arribadas famous for mass nesting, while Caribbean Tortuguero nesting runs roughly July to October for green turtles. Whale watching on the Pacific coast peaks in two windows, roughly July to October and December to April, when humpback whales migrate. Birdwatching is excellent year-round, with migratory species adding variety in northern winter months and resident species most vocal in green season mornings.
Surfing follows seasons too: Pacific swells are strongest in green season, especially May to October, while Caribbean surf peaks in northern winter months, roughly December to April, when Atlantic swells arrive. White-water rafting is best when rivers flow strongly in green season, though safety depends on daily conditions and guide advice. Zip-lining, canopy tours and hiking work in both seasons, with dry season offering drier trails and green season offering lusher scenery. Choose activities by season, not just by destination, for the best experience.
Costa Rica Weather Seasons: Hurricanes, Floods and Safety
Costa Rica weather seasons include a Caribbean hurricane season from June to November, though direct hurricane hits on Costa Rica are less common than in the northern Caribbean, because the country lies south of the main hurricane track. Heavy rain, however, can cause flooding, landslides and dangerous river currents, especially in mountain areas and during intense storms. The Instituto Meteorológico Nacional (IMN) issues forecasts and warnings, and local authorities advise on flood-prone roads. Take warnings seriously, avoid crossing flooded roads, and follow guide and hotel advice during storms.
For sea safety, check surf, currents and rip tide warnings before swimming, because Pacific beaches can have strong currents even on sunny days. Use lifeguarded beaches where available, swim with others, and avoid alcohol before swimming. For hiking, start early, carry rain gear, water and a charged phone, and tell someone your route. Costa Rica weather seasons are generally safe with preparation, but tropical rain and surf deserve respect in every month.
Costa Rica Weather Seasons: Best Time and Packing Guide
The best time for Costa Rica weather seasons depends on your goals. For reliable Pacific beach sunshine, December to April is best, with January to March often driest. For lush scenery, surfing, wildlife and lower prices, May to November offers rewards, especially with early starts. For the Caribbean, September and October can be a sweet spot when the Pacific is wettest, though rain remains possible. For cloud forests and mountains, dry season offers clearer views, while green season offers greener, mistier atmosphere and fewer visitors.
Packing for Costa Rica should include light, breathable clothes, swimwear, sunscreen, insect repellent, a rain jacket, waterproof bags, and sturdy walking shoes or sandals with grip. Add layers for mountain towns, where nights are cool, and a hat and water bottle for sunny beach days. With seasons understood and bags packed for both sun and rain, Costa Rica weather seasons become a planning tool rather than a gamble. For wider trip planning, see how to travel on a budget, travel insurance explained, and Costa Rica ecotourism and national parks guide.