Costa Rica Weather in March: What to Expect

March represents the apex of Costa Rica's dry season—the point where trade winds have been blowing for over four months and the accumulated drying effect is most intense. The Pacific coast, particularly Guanacaste in the northwest, becomes extremely arid. Rivers run low, vegetation turns golden-brown and deciduous trees shed their leaves, and the air takes on a dusty quality from dry roads and dry forest ground cover.

While the landscape may look parched, the beaches themselves are spectacular. Blue skies, calm seas, warm water (80–83°F/27–28°C), and intense sunshine make March beaches feel tropical and vibrant. The sun angle is nearly directly overhead in March at Costa Rica's latitude—this maximizes UV exposure and accounts for the intense heat, but also means your shadow is very short at midday and the quality of light is brilliant for photography.

March is also when the first hints of the next rainy season begin to appear in some areas. The southern Pacific—particularly the Osa Peninsula—may receive some early rain events in late March. This region's rainy season starts earlier than Guanacaste, so travelers planning Osa Peninsula visits should stick to the first half of March for the most reliable dry conditions.

Tamarindo / Flamingo / Conchal (Guanacaste): High 91–95°F (33–35°C), Low 74–77°F (23–25°C). Hottest beach temperatures of the year. Sea temperature 80–83°F (27–28°C). Trade winds moderate the heat on the coast.

Guanacaste Inland (Liberia, Filadelfia area): High 99–104°F (37–40°C). Extremely hot—genuinely dangerous heat in the shade during midday in March. Minimize outdoor exposure between 11 AM and 3 PM.

Central Pacific (Jacó, Manuel Antonio): High 88–92°F (31–33°C), Low 73–75°F (23–24°C). Very warm. Afternoon sea breezes help. Essentially no rain.

San José (Central Valley): High 82–84°F (28–29°C), Low 64–66°F (18–19°C). Hottest month in the capital but still comfortable compared to coast. Excellent visibility across the city.

La Fortuna / Arenal: High 85–88°F (29–31°C), Low 70–72°F (21–22°C). Warmest month inland. Rainfall 4–6 in (102–152 mm)—still low for this region.

Monteverde: High 70–73°F (21–23°C), Low 57–60°F (14–15°C). Trade winds blow strongly through the cloud forest. A jacket is necessary.

Caribbean (Puerto Viejo): High 84–86°F (29–30°C), Low 73–74°F (23–24°C). Rainfall 3–5 in (76–127 mm). Good conditions for Caribbean visits in March.

March is among the driest months in Costa Rica. Guanacaste coastal areas receive less than 0.5 inches (13 mm) of rain in March, and many years see no measurable rainfall at all during the month. San José averages under 0.5 inches (13 mm). The Central Pacific (Jacó, Manuel Antonio) receives 1–2 inches (25–51 mm), almost always as isolated events rather than sustained rain.

Relative humidity in March is at its annual low across Pacific regions. Guanacaste beaches average 55–65% relative humidity in March. San José drops to 50–60% humidity. This is notably dry by tropical standards—compare to the rainy season's 80–90% humidity at the same locations. The dry air is a significant factor in making March's high temperatures manageable, though the UV intensity compensates and sun protection remains critical.

The southern Pacific near the Osa Peninsula is an exception—this region receives some of the highest annual rainfall in the Americas and its dry season is shorter. Late March can see early-season rains near Drake Bay and the interior Osa Peninsula. For Corcovado National Park hiking, plan to visit in the first two weeks of March for the most reliable dry conditions.

The combination of intense tropical sunshine, high temperatures, and low humidity in March creates conditions where heat management is genuinely important for traveler wellbeing. The UV index in March reaches 11–12 (Extreme), meaning unprotected skin can burn in under 15 minutes at midday. Strong SPF 50+ broad-spectrum sunscreen is non-negotiable—apply 30 minutes before sun exposure and reapply every 90 minutes, more frequently if swimming.

Hydration is a health issue in March. The combination of heat, dry air, and physical activity can lead to dehydration faster than visitors expect. Carry a water bottle everywhere and aim for at least 3–4 liters of water daily during active days. Electrolyte tablets or sports drinks help replace salts lost through sweating during outdoor activities. Watch for signs of heat exhaustion: dizziness, nausea, weakness, and excessive sweating.

Strategic scheduling is the key to enjoying March comfortably. Plan outdoor activities—hiking, wildlife tours, beach activities—for 6:30–10:30 AM and 4:00–6:00 PM. Midday (11 AM–3:30 PM) is best spent in the pool, ocean, hammock, or air-conditioned space. This schedule actually aligns well with the natural rhythms of tropical life—Costa Ricans also reduce outdoor activity during the hottest part of the day.

March is complicated by two major crowd events. North American spring break typically spans from mid-March through early April, with peak weeks varying by university and school district. The younger, party-oriented spring break demographic concentrates at Jacó, Tamarindo, and to some extent Manuel Antonio. Other destinations like Nosara, Sámara, and the Osa Peninsula see far less spring break traffic and are better choices for families and travelers seeking a quieter experience.

Semana Santa—Holy Week, the week before Easter—is Costa Rica's equivalent of Thanksgiving and Christmas combined. When Easter falls in late March or very early April (it varies annually), Costa Rica's domestic vacation demand explodes. Beaches are crowded with Costa Rican families, accommodation in popular beach towns is booked solid, and traffic on Pacific coast highways can be extremely heavy on the Thursday and Friday before Easter. Check the Easter date for your travel year and plan accordingly.

March is outstanding for wildlife, particularly for birders. Resplendent quetzal breeding season peaks in March–April in the highlands. Males display their magnificent tail plumes (up to 24 inches/60 cm long) in courtship displays at Monteverde, San Gerardo de Dota, and the Talamanca Mountain corridor. This is the single best month to see this extraordinary bird in Costa Rica.

Scarlet macaw nesting is highly active in March, with breeding pairs loudly vocal and visible near their nesting trees along the Pacific coast. Carara National Park (between San José and Jacó) is the top location for macaw observation in March—the park straddles the boundary between dry and wet forest, creating exceptional biodiversity. Walking the primary trails at Carara in the early morning provides reliable macaw sightings and encounters with boa constrictors, basilisk lizards, crocodiles in the Río Tárcoles, and dozens of bird species.

For beach vacations, Guanacaste's northern beaches (Flamingo, Conchal, Potrero) offer excellent March conditions with slightly less crowd pressure than Tamarindo. Nosara is another excellent choice—the yoga and wellness community there attracts a different demographic than spring break party destinations, and the beach and wildlife are spectacular.

For nature and wildlife, San Gerardo de Dota for quetzal birding is the top March recommendation. Combine it with a San José stopover and a Central Valley coffee tour. Carara National Park is a must for scarlet macaws. For the adventurous, March is one of the last good months before the rainy season for accessing remote areas like Corcovado's interior trails or the backroads of the Nicoya Peninsula.

For families, Manuel Antonio provides the ideal combination of beach, wildlife, and family-friendly infrastructure in excellent March conditions. The national park, clear beaches, calm morning seas, and the diversity of Quepos town services make it the top family destination in March (and year-round).