Costa Rica Weather in January: What to Expect on Your Trip

January is firmly in the heart of Costa Rica's dry season on the Pacific coast. The trade winds that began arriving in December continue blowing steadily from the northeast, bringing dry air from the Caribbean side and sweeping Pacific skies clear of clouds. This meteorological pattern, called the papagayo wind system, creates the reliable sunshine that makes January one of the top travel months in Costa Rica.

Across most of the country, January weather characteristics include: minimal to zero rainfall on the Pacific coast, comfortable humidity levels (60–75% relative humidity), warm days and cool evenings, excellent road conditions on paved and unpaved routes, and optimal water visibility for snorkeling and diving. The contrast with the preceding rainy season makes January feel especially bright and fresh.

From a travel perspective, January is peak season. The Christmas–New Year's rush has subsided slightly (early January is noticeably calmer than late December), but popular destinations like Tamarindo, Manuel Antonio, and Arenal fill up quickly. Mid-January through February can actually be slightly less crowded than January 1–10, which still carries some holiday energy and pricing.

Guanacaste province is at its absolute driest and sunniest in January. The region—home to popular beach destinations like Tamarindo, Conchal, Flamingo, Potrero, Ocotal, and the Papagayo Peninsula—receives almost no measurable rainfall in January. Monthly totals are typically under 1 inch (25 mm) and many years see no rain at all for weeks at a stretch.

Daytime temperatures in Guanacaste beach towns average 88–92°F (31–33°C), while lows drop to 72–75°F (22–24°C) overnight. The trade winds (los alisios) provide reliable afternoon breezes that reduce the effective heat. These winds can be strong near the Papagayo Gulf—reaching 20–35 mph on some January days—making it excellent for windsurfing and kitesurfing but potentially choppy for snorkeling and kayaking.

The dry forest ecosystem of Guanacaste National Park and Santa Rosa National Park is particularly interesting in January. The trees begin dropping their leaves (this is the tropical dry forest's equivalent of autumn), making animal viewing easier as vegetation thins. White-tailed deer, pizotes (coatis), collared peccaries, and various monkeys are commonly seen in the more open January habitat.

The Central Pacific coast—including Jacó, Herradura, Quepos, and Manuel Antonio—is in clear dry season in January, with typical monthly rainfall of 1–2 inches (25–51 mm). Sunny mornings and blue skies make this region excellent for both beach time and national park visits. Manuel Antonio National Park is particularly rewarding in January, with well-maintained dry trails, thriving wildlife, and beautiful beaches.

Temperatures at Manuel Antonio and Jacó average 85–90°F (29–32°C) during the day and 73–75°F (23–24°C) at night. Ocean water is warm at 80–82°F (27–28°C). Snorkeling around Manuel Antonio's Cathedral Point and at Biesanz Beach can be excellent in January, with good visibility when sea conditions are calm.

Jacó remains a popular surf destination year-round, and January brings consistent if not large waves. The beach at Jacó itself is not recommended for swimming due to rip currents, but nearby Playa Hermosa de Jacó (south of town) is a world-class surf beach and has calmer conditions for wading. Kayaking tours and catamaran sunset cruises operate daily from Jacó and Manuel Antonio in January.

San José in January is a delight. Clear blue skies, cool breezes, comfortable temperatures of 75–79°F (24–26°C), and crisp mornings around 62°F (17°C) make the city a pleasure to explore. The holiday decorations from December are coming down, but the city settles into its regular vibrant pace with markets, museums, and restaurants all operating normally.

January is an excellent month for day trips from San José. The road to Poás Volcano is clear and accessible, with the best crater views of the year occurring on January mornings before 9 AM. The drive through Central Valley coffee towns—Grecia, Sarchí, Naranjo—showcases the region's famous ox-cart craftsmanship and traditional crafts. Sarchí is particularly famous for its brightly painted traditional ox-carts, a UNESCO Intangible Cultural Heritage item.

La Fortuna and the Arenal area represent one of the few inland destinations that maintains significant rainfall in January. Unlike the Pacific coast, La Fortuna receives about 4–5 inches (102–127 mm) of rain in January. This is much less than the rainy season peak but still enough that daily operations follow the sunny-morning, possible-afternoon-rain pattern.

Clear Arenal Volcano views are most likely in January. Early morning departures (6–8 AM) offer the best chance of seeing the volcano's perfect cone before clouds build. Hotel rooms or tours that position you facing the volcano at sunrise are worth the investment. Even on cloudy days, glimpses through parting clouds can be spectacular.

The hot springs around La Fortuna are at their most pleasant in January. Cool evenings (68–70°F/20–21°C) combined with thermal springs at 95–104°F (35–40°C) create ideal conditions for soaking. Tabacón Grand Thermal Resort and Baldi Hot Springs are the most elaborate facilities; public springs like Termales del Bosque offer a more budget-friendly experience.

January is a transitional month on the Caribbean coast. The southern Caribbean (Puerto Viejo, Cahuita) typically begins shifting toward its drier period (February–April) in January, but the transition is gradual. January may see 8–12 inches (203–305 mm) of rain—far more than the Pacific coast but less than the December peak. Some sunny beach days do occur in January on the Caribbean.

Tortuguero National Park in January is excellent for canal wildlife, particularly water birds like herons, egrets, kingfishers, and the remarkable sungrebe. The sea turtle nesting season (July–September) has ended, but manatees, caimans, river otters, and hundreds of bird species make any Tortuguero canal tour rewarding.

January requires advance planning due to peak season demand. Accommodations in Tamarindo, Manuel Antonio, Nosara, Santa Teresa, and Arenal/La Fortuna should be booked at least 2–3 months in advance for January visits. The first week of January (Jan 1–7) is particularly busy as holiday travelers are still present; mid-January through early February is busy but slightly more manageable.

Rental car reservations are essential for independent travel in January. Cars sell out well in advance at major agencies; book the same time you book flights. A 4WD vehicle is recommended for visiting any destinations with unpaved access roads, even in the dry season—some roads to beaches, waterfalls, and remote areas remain rough year-round.

Budget for peak season pricing. January rates for hotels and tours run 20–40% higher than the low season (September–October). However, the reliability of January's weather, the full operation of all tour and activity providers, and the optimal conditions for outdoor activities make this premium worthwhile for many travelers.