Costa Rica weather in August feels warm, bright and full of life. Mornings usually start with sunshine, the kind that brings out the deep greens of the forests and makes the beaches glow. Later in the day, short tropical showers roll in, adding a fresh, peaceful rhythm to the afternoons.
Because it is the green season, everything feels more relaxed. There are fewer crowds, better scenery and a slower pace that lets you enjoy the country in a more natural way. Understanding Costa Rica’s weather helps you plan days that feel easy, flexible and full of the moments you came for.
What Is the Weather Like in Costa Rica in August?
August falls squarely in Costa Rica’s green season. You can expect warm, humid conditions across most regions. While rainfall increases, it rarely lasts all day. Usually, mornings are bright and sunny, with showers or thunderstorms developing in the afternoon or evening.
Average Temperatures in August
Regional Climate Highlights
- Pacific Coast: The warmest region, reaching an average of 32°C (90°F). It is also notably more humid during this month.
- Caribbean Coast: Maintains a tropical heat with a daytime average of 30°C (86°F).
- San Jose: Offers a milder climate (often called “eternal spring”) with daytime averages of 27°C (81°F).
- Central Highlands: The coolest region, averaging 25°C (77°F) during the day and dropping to 17°C (63°F) at night. This area is often misty in the afternoons.
If you want to enjoy Costa Rica from the water this August, read our guide to Catamaran Adventures in Costa Rica to plan your perfect trip
Rainfall and Green Season 
Rain is very common in August but it does not usually last all day.
- Pacific Coast: 8–12 rainy days. Showers mostly in the afternoon.
- Caribbean Coast: Heavier rain, more unpredictable.
- Central Valley: Moderate rain, mostly in the afternoon.
Mornings are usually dry. Plan outdoor activities early in the day.
Regional Weather Breakdown
Costa Rica weather in August can vary a lot depending on the region. When you know what to expect, you can organize your activities and pick the best places to visit.
Pacific Coast
In August, the Pacific coast is hot and sticky. It is usually sunny in the mornings and rainy in the afternoons.
- Best spots: Tamarindo, Manuel Antonio, Santa Teresa
- Activities: Surfing, relaxing on the beach, exploring national parks
Caribbean Coast
The Pacific shore is drier than the Caribbean coast. It can rain at any moment, however mornings are usually dry. Plan activities early if you want to enjoy Costa Rica weather in August on this side.
- Best spots: Puerto Viejo, Cahuita
- Activities: Wildlife tours, hiking, visiting cacao farms
Central Valley
In the Central Valley, the mornings are warm and the evenings are cold. Costa Rica’s weather here is generally warm with rare afternoon rains.
- Activities: Coffee tours, city sightseeing, volcano trips
Northern Plains
August is a rainy month in the Northern Plains, but there aren’t as many tourists. This area is perfect if you want to experience Costa Rica’s weather in August without a lot of people.
Activities: Wildlife spotting, river tours, adventure parks
Did You Know?
Costa Rica is home to over 500,000 species of wildlife, including more than 900 bird species. August is an excellent month to spot colorful tropical birds and playful monkeys, especially in regions like Monteverde and Manuel Antonio.
If spotting monkeys sloths and tropical birds is on your list check Best Places to Snorkel in Costa Rica for a perfect combination of wildlife and water adventures in August.
Outdoor and Beach Activities and Events in August
In August, Costa Rica has mild weather, beautiful green scenery and fewer people. Costa Rica’s weather in August is great for beaches and outdoor activities in the morning. And the rain in the afternoon makes the forests and rivers feel better. This is a fantastic month to swim, surf and sail along the Caribbean and Pacific coasts. Tamarindo, Manuel Antonio and Puerto Viejo are all great beaches for relaxing or seeing animals.
Beyond the beaches, explore Monteverde’s cloud forests, hike trails around Arenal Volcano or cool off in waterfalls and rivers. Eco-parks and wildlife reserves such as Tortuguero and Corcovado are active and ideal for encounters with monkeys, sloths and tropical birds.
If you love ocean adventures, check out Best Costa Rica Boat Tour Experiences for Ocean Lovers for the top trips along the Pacific and Caribbean coasts.
Top Events and Celebrations in August
- August 2 – Virgin of Los Angeles Day
A religious holiday celebrated mainly in Cartago with processions, cultural performances and local gatherings. Visitors can experience traditional ceremonies and community festivities.
- August 15 – Mother’s Day Celebration
Many towns host special events, dinners and live music to honor mothers. Beaches and resorts often have brunches or sunset celebrations.
- Throughout August – Sea Turtle Nesting Season
August is a peak month for sea turtle nesting on both Pacific and Caribbean coasts. Guided tours in Tortuguero, Ostional and Playa Grande allow visitors to witness this natural spectacle safely.
- Throughout August – Local Markets and Outdoor Activities
Farmers’ markets, artisan fairs, yoga sessions and small cultural festivals happen across towns and beaches. From morning yoga in Nosara to craft fairs in San José, travelers can enjoy a vibrant mix of nature, culture and wellness.
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Catamaran Cruises and Ocean Experiences in August
August mornings are ideal for heading out on the water. Costa Rica weather in August often brings calm seas and clear skies before afternoon showers arrive. Planning trips in the morning helps make the most of these conditions.
Here’s what you can enjoy on a catamaran or other ocean experiences:
- Swim in clear, warm waters and explore vibrant reefs while snorkeling
- Visit secluded beaches and coastal viewpoints for relaxing stops
- Enjoy a refreshing drink or snack on board while taking in the scenery
- Try private boat charters for a more personalized experience
- Take part in sunset sails for stunning evening views
- Explore islands and hidden coves along the coast
Tip: Book morning departures to enjoy calmer waters and avoid afternoon rain showers.
This mix of experiences lets you enjoy the coast, marine life and stunning landscapes in one relaxing day.
Set sail on Costa Rica’s stunning coast. Book your shared catamaran tour today to snorkel, relax and soak in the ocean views!
Practical Travel Tips for August in Costa Rica
Knowing what to expect from Costa Rica weather in August can help you enjoy every moment of your trip. With the right preparation, you can make the most of sunny mornings, lush landscapes and refreshing afternoon showers.
Packing Essentials
- Bring quick-dry clothing to stay comfortable during warm and humid days
- Pack a light rain jacket for sudden showers
- Use a waterproof phone case to protect your devices on the water
- Carry insect repellent to stay comfortable in forests and near the coast
- Apply reef-safe sunscreen to protect your skin and the environment
- Wear water shoes for beaches, rivers and rocky trails
- Keep valuables in a small dry bag for boat trips
Travel Tips
- Book morning tours to enjoy calm seas and clear skies
- Consider a 4×4 if you plan to explore rural or mountainous areas
- Stay prepared for humidity and pack accordingly
- Check daily ocean conditions and confirm tours during the rainy season
You can have a smooth, relaxing and adventurous trip by following these tips while making the most of Costa Rica’s natural beauty in August.
Ready to sail in style? 5 Reasons to Charter the Tortuga Yacht Today shows why a private catamaran trip is the ultimate way to experience Costa Rica’s coast.
Final Thoughts
Costa Rica weather in August is warm, lively and full of color. You will usually wake up to sunny mornings that are perfect for the beach, hikes or wildlife tours. Afternoons may bring short tropical showers, which refresh the forests and rivers. You will enjoy fewer crowds and a slower pace that makes exploring more relaxed.
Plan your activities for the morning, pack a light rain jacket and choose your regions wisely to get the most out of your trip. August is a great time to surf, hike, sail and experience Costa Rica in its full natural beauty.
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Frequently Asked Questions: Costa Rica Weather in August
Does it rain all day in August?
No, rain usually falls in the afternoons or evenings. Mornings are often sunny.
Is August a good time to visit Costa Rica?
Yes, especially if you want fewer crowds and lush scenery. The Pacific coast and Central Valley are the best regions.
What should I pack for August?
Pack light, quick-dry clothing, a rain jacket, waterproof shoes and sun protection.
Will outdoor activities be ruined by rain?
Not necessarily. Mornings are mostly dry, which is perfect for hikes, wildlife tours and surfing.