Costa Rica Weather in April: Transition Month Guide

April occupies a unique position in Costa Rica's climate calendar. It's the last month of the dry season but simultaneously the first month when the rainy season begins to make its presence felt. This split character—part dry season, part rainy season—gives April a Jekyll-and-Hyde quality that depends significantly on when in the month you visit and which region you're in.

The dry season on the Pacific coast technically ends in April, though the precise timing varies each year by 1–3 weeks. In some years, Guanacaste stays largely dry through the end of April. In others, afternoon showers begin arriving in the second week of April. The Central and Southern Pacific tend to receive the first rains of the season earlier than Guanacaste—Manuel Antonio and Jacó may start seeing afternoon showers by mid-April while Tamarindo remains dry.

Despite the variability, April remains a very good travel month overall. Temperatures are high, the landscape is still sunny during mornings, and the first rains—when they arrive—typically follow the classic tropical pattern of sunny mornings and afternoon showers. The atmosphere becomes noticeably fresher as humidity increases with the arriving rains, and the first green shoots appear on the golden dry forest trees of Guanacaste.

April's weather divides fairly clearly between the first and second halves of the month. Understanding this split is crucial for April travel planning.

Early April (April 1–14): Conditions are very similar to March. Guanacaste is essentially in dry season, with clear skies and minimal rain. Temperatures remain hot at 90–95°F (32–35°C) in Guanacaste. The Central Pacific may see isolated afternoon showers, but mornings are sunny. This is still a reliable period for beach vacations and outdoor activities throughout the Pacific coast. The landscape in Guanacaste is at its most arid—golden-brown and dusty—but beaches are spectacular.

Late April (April 15–30): The first rains of the rainy season typically begin arriving during this window, particularly in the Central and Southern Pacific. Guanacaste may hold out dry through late April or begin seeing afternoon showers. Temperatures remain high but the arriving rains bring a beautiful freshening of the air and the first green flush to the dry forest. Hotel prices begin declining from their March peaks as the season transitions. Late April can be an excellent time for travelers comfortable with afternoon showers who want lower prices than March and a taste of both seasons.

Guanacaste (Tamarindo, Flamingo, Nosara, Sámara): High 90–95°F (32–35°C), Low 74–77°F (23–25°C). Hot and sunny in early April. First afternoon showers possible in late April. Sea temperature 82–84°F (28–29°C). Trade winds begin weakening as the season transitions.

Central Pacific (Jacó, Manuel Antonio): High 88–92°F (31–33°C), Low 73–75°F (23–24°C). First rains arriving by mid-April. Mornings sunny. Afternoon showers increasing through the month.

Southern Pacific (Dominical, Uvita, Osa Peninsula): High 85–89°F (29–32°C), Low 72–74°F (22–23°C). Rainfall: 4–8 inches (102–203 mm). Earliest start to rainy season. Visit early April for best Corcovado conditions.

San José (Central Valley): High 82°F (28°C), Low 65°F (18°C). Rainfall 1.5–2.5 in (38–64 mm) increasing through month. Still largely clear in early April. First rains arriving by mid-to-late April.

La Fortuna (Arenal area): High 84–87°F (29–31°C), Low 70–72°F (21–22°C). Rainfall 7–10 in (178–254 mm). Rainy season already active here. Waterfalls improving.

Caribbean Coast (Puerto Viejo): High 83–85°F (28–29°C), Low 72–74°F (22–23°C). Rainfall 6–10 in (152–254 mm). Good month—still in the Caribbean's drier period through April.

Semana Santa—Holy Week, the week preceding Easter Sunday—is Costa Rica's most important domestic holiday. Virtually the entire country takes vacation during this period, and the resulting demand for beach accommodations is extraordinary. Popular Pacific coast beaches become the most crowded they will be all year, with traffic on coastal roads backed up for hours on Holy Thursday and Holy Friday as families make their annual beach migration.

The practical implications for travelers: if Easter falls in April, book accommodations 4–6 months in advance for any Pacific beach destination. Alternatively, consider visiting the Caribbean coast (Puerto Viejo, Cahuita) or inland destinations (Arenal, Monteverde, San José) during Semana Santa—these are less affected by domestic beach migration and maintain better availability.

The cultural side of Semana Santa is worth experiencing if you can handle the crowds. Towns throughout Costa Rica hold Holy Week processions—solemn, beautiful religious marches through town centers with participants carrying religious statues and wearing robes. Cartago (the former capital east of San José) hosts particularly moving processions. These cultural events are part of Costa Rica's deeply Catholic heritage and offer insight into local traditions.

April is one of the most spectacular months for wildlife in Costa Rica, particularly for birding. Resplendent quetzal breeding season (which began in March) is in full effect, with males displaying brilliant tail plumes in highland cloud forests. San Gerardo de Dota and the Monteverde area offer the best quetzal viewing, with guided early-morning walks giving the highest probability of sightings.

Scarlet macaw nesting activity continues in April. The chicks, born in the dry season, are growing quickly and the nesting trees along the Pacific coast (particularly around Carara National Park and the Central Pacific) remain active with parental activity. The transition from dry to wet season in April triggers extraordinary breeding activity across all bird species—birders often rank April among the top months for species diversity.

Sea turtles: leatherback nesting at Playa Grande wraps up in April. By late April, the park has seen the last nesting females of the season, and the July–October olive ridley season at Ostional is months away. The Caribbean coast continues its marine turtle activity year-round at various scales.

April is one of the best months for visiting Costa Rica's Caribbean coast. The Caribbean's drier period (February through April) is in full effect, making April an excellent month for Puerto Viejo beach time, snorkeling at Cahuita National Park, and exploring the Talamanca jungle. The coral reef at Cahuita is at its most accessible in April, with calmer seas and better water clarity than the June–August period.

Puerto Viejo in April has a relaxed, sun-soaked atmosphere that contrasts with the busy Pacific destinations experiencing spring break traffic. The town's Afro-Caribbean culture—evident in the music, cuisine (rice and beans in coconut milk, patí pastries, agua de sapo drink), and laid-back lifestyle—is at full expression year-round but feels especially welcoming in April's favorable weather.

Early April activities: All the same outdoor activities as the dry season—beach time, snorkeling, hiking, wildlife tours—are available and excellent in early April. National park visits, volcano day trips, and Pacific coast beach vacations are all superb. The Osa Peninsula (Corcovado) is best visited in the first two weeks of April before trails become wetter.

Late April activities: Morning outdoor activities remain excellent—wildlife tours, hiking, surfing (early morning before wind), and beach time are all enjoyable. The arriving afternoon rains make mid-afternoon relaxation, cooking classes, or spa treatments more appealing. White-water rafting becomes more exciting as rivers begin rising with the first rains. Photography opportunities are exceptional as the parched landscape begins greening in the first weeks of rain.

Year-round highlights in April: Resplendent quetzal birding in San Gerardo de Dota (best March–May), Cahuita National Park snorkeling (best February–April), coffee farm tours (end of harvest season), and cultural events including Semana Santa processions in Cartago and other towns.