Costa Rica in August: Weather, Crowds & What to Expect

Guanacaste & Northwest Pacific (Liberia, Tamarindo, Nosara)

August typically feels very humid with a mix of sunshine and daily cloud build-up that often collapses into heavy late-afternoon storms; road conditions can deteriorate quickly on rural routes. Birdwatchers and photographers enjoy the season’s lush landscapes, but scheduled activities like zip-lining or fishing can be delayed by weather. Bring quick-drying clothing, insect repellent, and flexible plans - mornings are the most reliable time for outdoor adventures.

Nicoya Peninsula & Northern Central Pacific (Santa Teresa, Montezuma, Nicoya)

August usually feels thick and tropical; daily cloud build-up frequently results in late-afternoon downpours that can be heavy and persistent in valleys near Montezuma. Boat access to isolated coves becomes more weather-dependent, so coastal island-hopping tours run on calmer mornings. Travelers who want solitude will find it, but bring waterproof bags for gear and be prepared for muddy taxi rides between towns.

Central Pacific (Manuel Antonio, Jaco, Puntarenas)

August is humid with regular cloud build-up that tends to break into heavy afternoon and evening downpours, leaving mornings clear for excursions and wildlife watching. Fishermen and tour operators plan most trips for early mornings, so book dawn outings if you want the best sea conditions. Roads in rural spots can become boggy; waterproof shoes and a flexible itinerary make travel easier.

Southern Pacific & Osa Peninsula (Uvita, Dominical, Corcovado)

August remains humid and frequently rainy, with persistent cloud cover and heavy showers that can limit long overland drives between communities like Uvita and the Osa Peninsula. The jungle sessions create dramatic waterfalls and swollen rivers that appeal to adventurous travelers, but always hire experienced local guides for multi-day treks. Waterproof gear, sturdy shoes and flexible itineraries are essential.

Central Valley & Highlands (San José, Alajuela, Cartago, Poás, Arenal, Monteverde)

August is humid with regular afternoon storms that clear to calm evenings; cloud cover can make crater and cloud-forest views intermittent, but the landscape is intensely green and vibrant. Birdwatching is excellent at dawn in Monteverde and around Arenal while waterfalls run strongly; plan morning excursions and accept likely afternoon rain. Bring waterproof cases for cameras and footwear with good grip for muddy trails.

Caribbean Coast (Puerto Viejo, Cahuita, Tortuguero)

August tends to be humid with regular cloud build-up that frequently collapses into heavy afternoon or evening showers; coastal roads can become slick and boat schedules may shift. Turtle nesting at certain sites can be active in parts of the Caribbean seasonally, so check local conservation calendars for guided night visits. Carry insect repellent, waterproof phone protection and expect a mix of bright mornings and stormy afternoons.