August weather in Costa Rica: the complete guide
August in Costa Rica?
Green season on the Pacific with afternoon showers, but humpback whales peak at Uvita and green turtles peak at Tortuguero. Prices are 20-30% below high season. Plan activities for mornings; expect rain after lunch on the Pacific.
August in Costa Rica: the green season hits its stride
August occupies a contradictory place on most travel blogs. Listed as a month to approach with caution due to Pacific rainfall, it is simultaneously one of the most wildlife-spectacular months in the country. Two of Costa Rica’s headline wildlife events peak simultaneously in August: southern hemisphere humpback whale calving at Marino Ballena and green sea turtle nesting at Tortuguero. Neither event cares about the rain.
The honest framing for August is this: if you build your trip around what August genuinely delivers — wildlife, waterfalls, uncrowded parks, green prices — you will have a remarkable trip. If you arrive expecting the dry Pacific beach experience of January, you will be disappointed. This guide tells you what to expect across each region and how to use August strategically.
Pacific north (Guanacaste) in August: afternoon showers, reliable mornings
Guanacaste in August is in full green season. Monthly rainfall in Liberia and Tamarindo averages 150-200 mm, which sounds significant until you understand how it falls: not all day, but in concentrated afternoon and early evening bursts. A typical August day in Tamarindo has sunshine from 6am to about noon, clouds building through early afternoon, and rain arriving between 2pm and 5pm, sometimes lasting into evening.
This pattern is useful rather than catastrophic. Morning activities — surf lessons at Tamarindo, horseback riding on the beach, ATV tours through dry forest, catamaran trips — run in reliably good conditions. Operators schedule departures specifically to beat the afternoon rain. Book morning slots and you largely avoid the worst of it.
The upside of Guanacaste in August is real. The dry forest landscape transforms from dusty brown to vivid green. Waterfalls that barely trickle in March run at full volume. Hotel rates on average 20-30% below January. The beaches — Tamarindo, Playa Conchal, Nosara, Sámara — are uncrowded. Service at restaurants is unhurried. You will not queue for entry at Rincón de la Vieja.
The downside is equally honest: some unpaved access roads to remote beaches become muddy and require 4WD. The afternoon rain is reliable enough that it genuinely affects outdoor plans for a few hours daily. Surfing conditions in Guanacaste improve in green season (stronger swells), but casual beach days are less reliable than in January.
Central Pacific (Manuel Antonio, Jacó) in August: wildlife parks in the wet
Manuel Antonio in August sees consistent rainfall similar to Guanacaste — mornings typically clear, afternoons wet. The national park’s wildlife operates without reference to the rain calendar. Sloths, white-faced capuchins, howler monkeys, squirrel monkeys, and coatis are as active in August as in December. In fact, August visitors often report quieter, more wildlife-productive park visits simply because there are fewer visitors disturbing the animals.
A practical note: Manuel Antonio National Park closes every Tuesday regardless of month. Plan around this if arriving on a Monday. Reservations for park entry are required year-round — book through the SINAC system at least a few days ahead in August even in low season.
Jacó is popular for surfing in August. The Pacific swells run consistently and the surfing community is active. Green season Jacó is authentic in a way the resort-crowded January version is not. The surf schools run morning lessons, the bars and restaurants are open, and the casual beach town energy is at its most local.
Southern Pacific (Uvita, Osa Peninsula) in August: the whale watching peak
This is the essential August fact: the waters off Uvita and Marino Ballena National Park are at their best for humpback whale watching in July-August-September. The southern hemisphere humpback population, having fed in Antarctic waters, arrives in Costa Rica’s warm Pacific to give birth and nurse calves. August is the absolute peak of this activity.
On a good August morning in Uvita, whale watching boats regularly encounter mother-calf pairs. Humpbacks breach, slap the surface with pectoral fins, and cruise close enough to make photography straightforward. August sea conditions are often calm enough in the mornings for comfortable viewing, though afternoon swells pick up. Reputable operators depart early (6:30-7am) to maximise calm water and whale activity simultaneously.
Marino Ballena: whale watching in Uvita — from $80The Osa Peninsula in August receives heavy rainfall — 250-350 mm is common, and the Corcovado rainforest is dramatically alive. The Drake Bay and Corcovado area suits travellers who genuinely embrace rainforest conditions. Wildlife density in Corcovado is extraordinary year-round: tapirs, peccaries, scarlet macaws, poison dart frogs, and potentially jaguar sightings for the very patient. August adds the spectacle of full-flowing rivers and dramatically green vegetation.
One practical note: check road conditions for the Osa Peninsula in August. Unpaved roads to Drake Bay and some Puerto Jiménez area access routes can be challenging after heavy rain. Flight options from San José (Sansa airlines, approximately 50 minutes) sidestep the road question entirely and are worth the cost if Corcovado is a priority.
Tortuguero in August: green turtle nesting at its peak
If there is one reason to visit Tortuguero in August specifically, it is this: green sea turtle nesting peaks in August and September. The beach at Tortuguero receives more green turtle nesting attempts per night in August than any other month. Nightly turtle watches operate under strict protocols — no white flashlights, red-light guides only, small groups — and departures happen when scouts confirm turtle activity. On a good August night, groups may observe turtles nesting for 20-40 minutes at close range.
Green sea turtle nesting tour — from $55Beyond the turtles, Tortuguero’s canal network is a legitimate wildlife spectacle throughout August. Morning boat tours regularly encounter caimans basking on banks, herons hunting at water’s edge, river turtles sunning on logs, monkeys crossing canopy bridges overhead, and sloths visible in the cecropia trees. The rainforest is at its most lush and the canal lodges (Tortuga Lodge, Mawamba, Pachira) are quiet enough that you may have the waterways largely to yourself.
Getting to Tortuguero in August is straightforward. The standard route from San José via Cariari (bus + boat) takes about 4-5 hours. Sansa operates flights that take 35 minutes. The lodges typically organise arrival transfers — confirm your logistics before departure.
Caribbean coast in August: still relatively dry
The Caribbean coast (Puerto Viejo, Cahuita) operates on a different moisture pattern from the Pacific. August on the Caribbean is not the full dry season — that comes in September-October — but it is considerably drier than the Caribbean’s peak rainy months (November-January). Many August days in Puerto Viejo see morning sun, afternoon clouds, and manageable rain if any.
This makes the Caribbean a viable August option, particularly in the first half of the month. Punta Uva beach south of Puerto Viejo is one of the most beautiful Caribbean stretches in the country, and August crowds are thin. Cahuita National Park’s reef snorkelling is best in calmer conditions. Visibility varies with rain runoff and sea state — ask locally before booking.
The Caribbean adds cultural dimension that the Pacific does not replicate: the Afro-Caribbean food tradition (rice and beans, jerk chicken, patties, pan bon), the reggae soundtrack from beachside bars, the Bribrí and Cabécar indigenous communities in the Talamanca mountains above Puerto Viejo. This cultural experience is unchanged by the season.
La Fortuna and Monteverde in August: waterfalls and mist
La Fortuna and the Arenal area receive significant August rainfall, but the experience is far from ruined. The La Fortuna Waterfall runs at its most powerful and most photogenic — the climb down the 500 steps to the pool base is wet whether it is raining or not, and arriving to find the falls at full cascade volume is genuinely spectacular. Morning visits typically have clearer skies and Arenal Volcano occasionally reveals itself before cloud cover builds.
Hot springs in the Arenal area operate year-round and arguably feel more appealing in green season — soaking in a volcanic thermal pool while rain patters on jungle canopy is a legitimate pleasure. Tabacón and Nayara Springs operate fully in August. Rates at most Arenal hotels are 20-25% below January.
Monteverde in August is deep cloud forest season. The forest is at maximum mist density, epiphyte growth is extraordinary, and the suspension bridges at Selvatura or Mistico Parks pass through genuine cloud. Visitors expecting to see Arenal Volcano from the Monteverde viewpoints will be disappointed — it will be in cloud. Visitors who come for the cloud forest experience itself, the birding, the night hikes, and the atmospheric mist-wrapped trails will find August Monteverde exactly what it promises.
August wildlife highlights
Humpback whales at Marino Ballena: July-October is the southern hemisphere humpback season, and August-September represents the peak. The breeding aggregation off Uvita brings a combination of active bulls, mother-calf pairs, and escort males. Encounter rates in August are among the highest of the season.
Green sea turtles at Tortuguero: August-September is the peak nesting period for the largest green turtle population in the western Atlantic. Tortuguero beach is the most important green turtle nesting site in the region, and August nights regularly see dozens to hundreds of nesting attempts. Nighttime turtle watches are one of Costa Rica’s most extraordinary wildlife experiences.
Olive Ridley turtles beginning at Ostional: The Olive Ridley arribada season starts building in August at Ostional beach on the Nicoya Peninsula. The full mass nesting synchronised to the waning moon becomes most spectacular in September-October, but August already sees significant individual nesting. Access is managed through the ADIO community cooperative.
Caño Negro wildlife: The Caño Negro wetland near the Nicaraguan border is at peak wetland extent in August. Boat tours through the lagoon encounter nesting colonies of anhingas, neotropic cormorants, boat-billed herons, and roseate spoonbills at close range. Caimans are consistently visible. Caño Negro in August is one of the best waterbird spectacles in Central America.
Caño Negro: rivers and lagoons bird, flora and fauna tour — from $95Resplendent quetzals at San Gerardo de Dota: Quetzal nesting season (April-June) has ended by August, but resplendent quetzals are present year-round in the Savegre Valley. August birding in San Gerardo de Dota adds dozens of highland species to the resident quetzals — silky flycatchers, trogons, emerald toucanets, and numerous warbler species moving through.
Accommodation and pricing in August
August sits in green season pricing, which represents real savings across most Pacific coast and central regions. Typical daily per-person ranges:
| Travel style | Daily per person |
|---|---|
| Backpacker | $45-65 |
| Mid-range | $95-145 |
| Comfort | $170-280 |
| Luxury | $320-600+ |
Luxury properties discount 15-25% compared to January. Tortuguero lodges typically include meals and tours in their package rates — the all-inclusive structure is standard there regardless of season. Caribbean coast accommodation prices August similarly to the rest of green season.
One exception: whale watching tours and turtle watching operations near Uvita run at standard prices in August because demand is high from wildlife-focused travellers who specifically time their trips to the peak season.
August itinerary strategy
A strong 10-day August itinerary prioritises wildlife over beach:
Days 1-2: San José — transit, city tour, La Paz Waterfall Gardens (impressive at full flow in August) Days 3-5: Tortuguero — canal tours, green turtle nesting nights Days 6-8: Uvita and Southern Pacific — humpback whale watching (morning departures), Marino Ballena beach, Caño Island snorkelling if conditions allow Days 9-10: La Fortuna — La Fortuna Waterfall, hot springs, Arenal hanging bridges
For 7 days: combine Tortuguero (3 nights) with La Fortuna (3 nights) for a wildlife-and-hot-springs core that works well regardless of Pacific rain.
What to pack for August
- Waterproof rain jacket (not just a poncho — you need your hands free)
- Quick-dry clothes: shorts, T-shirts, lightweight trousers that dry overnight
- Waterproof daypack or dry sack for cameras and electronics
- Trail shoes or waterproof sandals with grip (Tevas, Chacos)
- Insect repellent — green season means more mosquitoes, particularly at Tortuguero
- Binoculars if wildlife is a priority — essential for whale watching and bird watching
- Light layer for Caribbean evenings and Monteverde cloud forest (can reach 14-18°C)
Frequently asked questions about August weather in Costa Rica
Is August the worst month to visit Costa Rica?
No. August has a reputation for rain on the Pacific, which is accurate — afternoon showers are reliable. But August is also the peak month for humpback whale watching and green turtle nesting, two of Costa Rica’s most extraordinary wildlife experiences. August suits wildlife-focused and budget-conscious travellers very well. Pure beach holiday travellers wanting guaranteed sun should consider January-April instead.
How bad is the rain in August?
On the Pacific coast, rain typically arrives in the afternoon (2-5pm) and lasts a few hours. Mornings are often clear. Total monthly rainfall in Guanacaste is 150-200 mm — significant but manageable with good planning. The Southern Pacific (Osa, Uvita) is wetter, 250-350 mm. The Caribbean coast is drier in August than the Pacific.
Can I see whales in August?
Yes — August is the single best month for humpback whale watching at Marino Ballena near Uvita. The southern hemisphere humpback population peaks in July-September, and August combines maximum whale density with manageable sea conditions for morning boat tours. See our Uvita guide for operator recommendations.
Is Corcovado worth visiting in August?
Yes, but it requires planning. The Corcovado trails are wet and muddy in August. The Sirena ranger station is accessible in August (unlike some September-November periods when flooding can affect operations). Wildlife is outstanding year-round in Corcovado — August does not diminish it. Check SINAC conditions before booking and hire a licensed guide, which is mandatory for Sirena station visits.
Are there mosquitoes in August?
More than in dry season, particularly in low-lying areas and at Tortuguero where the canal environment means standing water is everywhere. DEET-based repellent is advisable, especially for evening turtle watches and canal boat tours. Tortuguero lodges typically provide mosquito nets. Malaria risk is minimal for standard tourist destinations — check with a travel health clinic for your specific itinerary.
Frequently asked questions
Is August a good time to visit Costa Rica?
Yes, with realistic expectations. August is the heart of green season on the Pacific, which means afternoon rain is reliable — not the whole day. The Caribbean is still relatively dry in early August. Humpback whale watching at Uvita peaks, and Tortuguero turtle nesting is at maximum activity. Accommodation prices are 20-30% below January rates.
Where to go in August?
Uvita and the Southern Pacific for humpback whales (peak season). Tortuguero for green turtle nesting (August-September peak). The Caribbean coast (Puerto Viejo, Cahuita) is drier than the Pacific. La Fortuna works well — the Arenal area gets rain but mornings are often clear and activities run reliably.
What about rain in August?
Pacific coast gets reliable afternoon rain, typically 2-4 hours from around 2pm. Guanacaste averages 150-200 mm in August. The Osa Peninsula and Southern Pacific receive the most, sometimes 300 mm. Caribbean coast is relatively drier, especially mornings. Central Valley and highlands get evening thunderstorms. Mornings across the country are usually good for activities.
How much does it cost?
August is green season pricing: $45-65 per person per day for backpackers, $95-145 mid-range, $170-280 comfort. Luxury eco-lodges like Lapa Rios or Nayara Springs discount 15-25%. Christmas-level pricing does not apply. The main exception is whale watching boats, which run at full price due to demand.
What about wildlife in August?
August is one of the best wildlife months in the country. Humpback whales from the southern hemisphere peak in Marino Ballena waters. Green sea turtles peak at Tortuguero beach. Olive Ridley turtles start arriving at Ostional. Resplendent quetzals are post-nesting but visible at San Gerardo de Dota. Caño Negro offers excellent bird and caiman observation.