Things to Do in Costa Rica in August

August puts you squarely in the migration window for Southern Hemisphere humpbacks. The waters between Uvita and Drake Bay are where they concentrate. Marino Ballena National Park, whose tombolo sandbar is shaped like a whale's tail at low tide, is the departure point for most tours. On a good morning, and most August mornings are good, the sea is glassy and green-grey before the afternoon weather builds. You can hear a whale exhale before you see the blow. Cow-calf pairs surface lazily, close enough that the salt spray from a breach reaches the boat. The water itself runs around 27°C (80°F). Warm enough that when a whale sounds and you are waiting, you can dangle your hand in the Pacific and feel nothing but bathwater. Morning departures between 7 and 8 AM are the standard. Back before lunch and before the swells pick up. The season runs July through November. August tends to deliver the densest concentration of sightings before the heaviest rains of September and October push choppier conditions.

August rainfall pushes the Pacuare to Class III-IV, its most exciting navigable levels without tipping into dangerous territory. The river cuts a gorge through the Talamanca Mountains that feels primordial. Primary rainforest canopy closes overhead. Waterfalls pour directly off canyon walls into the rapids. Toucans and scarlet macaws cross above the river in flashes of colour that you catch between paddle strokes. The water is warm enough, around 24°C (75°F), that wetsuits are unnecessary. This matters when you are soaked anyway. The spray from the rapids carries a mineral, almost metallic scent that mixes with the wet-earth smell of the surrounding jungle. Two-day trips with overnight camps on raised platforms above the river exist and are worth the extra time. The second day's rapids are stronger. The morning mist rising off the water at dawn makes the gorge look like something from a different geological era entirely. The Pacuare is widely considered one of the top ten rafting rivers in the world. August is arguably its finest month.

Here is what dry-season visitors never grasp about Monteverde in August: the cloud forest thrives on moisture, not merely tolerates it. At 1,400 m (4,593 ft), you cross suspended bridges through actual clouds. Mist rolls through the canopy in waves, condensing on every surface, dripping from bromeliads and mosses and the long beards of old man's lichen that hang from branches. The air stays cool up here, around 18°C (64°F). Pack a light layer. It smells of wet earth, decomposing leaves, and something faintly sweet from orchids that peak-bloom during wet months. The resplendent quetzal, Costa Rica's most coveted bird sighting, proves easier to spot in August when males display near fruiting wild avocado trees. Fewer visitors on the bridges mean your guide can pause to point out a glass frog flattened against a leaf or a pit viper coiled motionless on a branch. Details like these get missed when thirty people push from behind. Monteverde sees rain, obviously. At this altitude it often arrives as fine drizzle rather than Pacific-lowland downpours. Most hanging bridge circuits stay sheltered enough by canopy that a light jacket handles it.

Manuel Antonio in August becomes a different park from the one overrun each January. Trails that normally queue with selfie sticks at Cathedral Point grow quiet enough for your guide to crouch beside leaf-cutter ants without blocking anyone. White-faced capuchins grow bolder with reduced foot traffic, swinging low enough overhead that you hear branches creak before you spot them. Two-toed sloths hang motionless in cecropia trees along the main trail. In August, red-eyed tree frogs emerge in numbers the dry months cannot match. The park is small, only about 1,983 hectares (4,900 acres). The wildlife density per square metre stuns. This is where rainforest presses against white sand beaches and warm Pacific water. Mornings from the 7 AM opening run clear and humid. The air carries the green-rot smell of forest floor and distant waves crashing at Playa Espadilla. Rain usually arrives by early afternoon. By then you have seen more animals in four hours than most people manage in a week elsewhere. Beaches inside the park stay swimmable in August when surf stays manageable. The water runs warm enough for hour-long sessions.

August gives surfers what they chase in Costa Rica: consistent swells from distant Pacific storms, warm water, and lineups thinned by green season departures. Tamarindo's wide sandy-bottom breaks suit beginners learning to pop up, with forgiving waves and waist-deep water. Further south, Playa Hermosa near Jacó delivers the serious session. It is a powerful beach break with lefts and rights that barrel on bigger days. Down near the Panamanian border, Pavones fires one of the longest left-hand point breaks in the world when conditions align. August offers its best chance. Water temperature holds steady at 27°C (80°F) across the Pacific coast. Boardshorts or a rash guard suffice. Dawn patrol brings glassy, offshore conditions before onshore wind builds around 10 AM. Paddling out at first light with jungle spilling to the sand behind you and wood smoke drifting from a beach soda's breakfast grill feels unmatched anywhere else. Afternoon sessions prove hit or miss with weather. Post-rain sunset glass-offs can produce clean conditions when timing cooperates.

When afternoon rain arrives, and around Arenal it arrives with theatrical force, Costa Rica's geothermally heated springs turn the downpour into the main attraction. Sitting chest-deep in 37 to 40°C (99 to 104°F) mineral water while rain hammers the jungle canopy three metres above your head, steam curling off the pool surface and mixing with low clouds, is one of those experiences that is specifically and unreplicatably Costa Rican. The water carries a faint sulphur-mineral edge, not unpleasant, and your skin feels slick and softened after twenty minutes. Mornings before the rain are good for the hanging bridge circuits through old-growth forest at the volcano's base, where howler monkeys bellow from somewhere in the canopy and the steam from the forest floor after overnight moisture makes the whole scene look like a slow-motion nature documentary. The bridges span ravines and river gorges at heights up to 60 m (197 ft), and in August the ferns and philodendrons growing on every available surface are at their most extravagant. Arenal volcano itself has been seismically quiet since 2010, but the geothermal system beneath it is very much alive, and the hot springs are the evidence of that. The combination of morning forest walks and afternoon soaking in volcanic water makes Arenal one of the most satisfying full days in Costa Rica regardless of weather, and in August it might be the single best use of a rainy afternoon anywhere in the country.