On a December afternoon in Jaco, surfers wait for the last good set while the dark sand turns bronze and the bars along the main strip start to hum. In September the same beach is quieter, the sky builds into slate-gray towers by midday, and the town smells of wet earth and grilled fish. The year here swings between a bright, busy dry season and a green, showery one, and the town keeps its surf-and-sunset rhythm through both.
When is the best time to visit Jaco?
The best months for most visitors are December through April, while the green months of May to November reward travelers who accept frequent rain, often in the afternoon.
For beach and sea time, the dry months are the easy choice. February and March bring relatively little rain and warm water, making it easier to plan beach time, a surf lesson and dinner outside. Even then a few showers pass through, so treat them as a short interruption rather than a ruined day.
If you want to sightsee, the mornings matter in every season. If you head to Carara National Park, where scarlet macaws may show up but are never promised, and also pause at the Tarcoles River bridge to peer down at crocodiles, plan for early in the day, ahead of the building afternoon cloud. In the green season the forest is lusher and the light is soft, which many photographers prefer.
For a quieter, easier-on-the-wallet stay, the middle of the rainy season is the time. Rooms are easier to find, restaurants have free tables and the surf breaks are less crowded. Rain usually arrives in the afternoon, so mornings are for the beach and the afternoons for a long lunch, a spa or a nap with the sound of the downpour on the roof.
Families should think carefully about March. Spring break fills the town with college groups and the nightlife gets loud and late, especially near the center. For families, January or February often feels more relaxed, away from the busiest holiday periods. Beginners and kids learning to surf do well with a lesson in the morning, when the waves are usually more manageable.
Jaco weather by month
Jaco is hot all year, with temperatures that barely move while the rain and the sea tell the real story.
| Month | Average high (°F) | Average low (°F) | Rain days | Sea (°F) |
|---|---|---|---|---|
| January | 82.5 | 75.3 | 14.1 | 86.1 |
| February | 84.0 | 76.1 | 7.8 | 87.4 |
| March | 84.9 | 77.0 | 11.5 | 87.7 |
| April | 83.8 | 77.0 | 21.5 | 87.9 |
| May | 82.3 | 76.5 | 29.6 | 88.0 |
| June | 81.8 | 76.1 | 29.1 | 85.9 |
| July | 81.4 | 75.8 | 30.2 | 85.4 |
| August | 81.4 | 75.7 | 30.3 | 85.7 |
| September | 81.2 | 75.4 | 29.7 | 86.1 |
| October | 80.5 | 75.1 | 30.0 | 85.4 |
| November | 80.5 | 75.1 | 27.4 | 83.3 |
| December | 81.2 | 75.2 | 22.0 | 84.7 |
The shape of the year is easy to read. From January to March rain is less frequent than during the green season, and February has the fewest rainy days.
April is the turning point, when afternoon storms begin to return, and from May through November it rains on nearly every day, usually as an afternoon downpour with mornings that are often clear. October is among the soggiest months, with heavy rain on many days. December eases back toward the dry season. Temperatures hardly change, so the question is never whether it will be warm, only how wet the afternoons will be.
What is there to do in Jaco in each season?
The dry months: surf, sunsets and day trips
From December to April, Jaco is at its liveliest. Mornings start with coffee and a walk on the long dark-sand beach, and the beach break draws both beginners and experienced surfers, with lessons and board rentals all along the strip. Lessons and board rentals are available along the strip for beginners as well as experienced surfers.
Days out are easy in the dry season. Carara National Park is a short drive north and the walking trails are firmer underfoot, while the Tarcoles River bridge is a quick stop on the way. Evenings belong to the sunset on the sand, followed by grilled fish, ceviche or a casado, the plate of rice, beans, salad and a main that is the standard Costa Rican lunch.
The green months: rain, rainforest and quiet
From May to November the hills turn deep green and waterfalls swell. The pattern is simple: plan outdoor things for the morning and leave the afternoon flexible. Rainforest walks and bird watching are rewarding when the forest is dripping and loud, and guided walks are how most visitors spot animals.
Surf can be strong in these months, and most beaches have no lifeguards or warnings about unsafe conditions, so beginners should take a lesson and treat the water cautiously. Rip currents are very dangerous on this coast and most beaches have no lifeguards, so this is the season for respecting the water. On rainy afternoons, the town offers cafés, massage, and long dinners.
Shoulder weeks and the winter holidays
Late November and early December are a pleasant in-between, with green hills and a growing share of sunny days as the dry season approaches. April is the opposite, a sunny start that gradually gives way to afternoon storms. Both are good for visitors who want warm weather without the busiest crowds.
Around Christmas and New Year the town is busy, with families, surfers and visitors from the highlands filling the hotels. Book early, plan beach hours for the morning and leave the quiet corners of Carara for a weekday.
When is Jaco cheapest and least crowded?
The quietest stretch runs from May through much of November, when the rainy season thins out the crowds and the town slows down. Hotels have rooms, restaurants have tables and the beach has long empty stretches, especially on weekdays. September and October are the calmest of all, and many travelers enjoy the stillness.
The busiest weeks are the ones you would expect. Christmas and New Year fill the town, Easter week brings Costa Rican families to the coast, and March spring break brings loud, late-night groups. The U.S. school vacation in summer, from early July to late August, also brings more visitors than the weather would suggest, so rooms are more likely to be booked at peak-season rates.
If you want sunshine without the crush, aim for January or early February, or the second half of April, when the dry season is still holding but the big holiday weeks have passed. On any trip, weekdays feel calmer than weekends, when people from San Jose come down for the beach.
Which months should you avoid in Jaco?
No month is off limits, but travelers who dislike rain should be cautious about May through October, when showers arrive almost every day and the heaviest storms often fall in the afternoon.
The Atlantic hurricane season is not what shapes weather on this Pacific coast, and the rains here come from the local wet season instead. In the wettest weeks, rivers rise, trails turn muddy and some outings may be shortened or moved to the morning. The sea can be rough and cloudy after storms, so beach days sometimes need to be flexible.
Heat is steady all year, so it is not a reason to skip a month, but midday in March and April can feel intense and a hat, shade and water are welcome. Sargassum is mostly a Caribbean story and the beach here is usually spared, but no beach can be promised to be spotless on any day. Winter cold fronts that affect other places do not apply here.
In any month, rip currents are the real hazard, and most beaches here do not have lifeguards or warnings about unsafe conditions. That matters more than the forecast.
When can you swim in Jaco?
You can get in the water year-round, because the sea here stays warm in every month, from pleasantly warm in November to bath-like in the spring.
The warmest water arrives from March to May, just as the dry season ends, while the coolest readings come in the middle of the rainy season and in November. Even then, the difference is slight and nobody needs a wetsuit. You can just feel how warm or cool it is without any numbers to check.
Warm water does not mean easy water. Day to day, the surf and currents shift, rip currents pose a serious threat and drown several U.S. tourists every year, and lifeguards are absent from most beaches. Swim near others, ask a local surf shop about the day’s conditions and treat the surf as something to respect.
Festivals and events in Jaco through the year
Winter holidays, Carnival and Easter week
Christmas and New Year bring a festive, crowded mood to Jaco, with lights, beach parties and families on the sand. Christmas is December 25, and many Costa Rican families make the coast part of their holiday. Tamales, a traditional holiday dish wrapped in banana leaves, appear in homes and restaurants.
Easter week, usually in March or April, is one of the busiest times on Costa Rican beaches, since locals travel to the coast. Expect crowds, music and a holiday feeling, and plan rooms well in advance. Spring break in March brings a different crowd, younger and louder, with nightlife that runs late.
Surf culture and local fiestas
Surf is the town’s heartbeat, and visiting surfers often time a trip around bigger swells in the green season.
Costa Rica celebrates Independence Day on September 15, and a school-led parade with drums and lanterns is traditional across the country the night before. In a beach town like Jaco, it is a small local moment rather than a major event, but it is a pleasant glimpse of everyday life in the quiet season.
Nature seasons: macaws, crocodiles and turtles
Scarlet macaws are a chance in Carara National Park in any month, and early mornings give the best odds, when the birds are loud and active. The Tarcoles River bridge shows crocodiles basking on the banks, and it is an easy stop at any time of year.
Sea turtles and whales visit parts of the Pacific coast at certain times of year, but they are chances rather than promises, and it is best to ask a local guide what is possible during your visit. In the green season, the forest is at its noisiest, with frogs, insects and birds filling the evening.
Sources
- Open-Meteo / ECMWF ERA5, normals 1991-2020 computed for the grid cell at 9.6145N 84.6285W, checked October 8, 2026
- Open-Meteo Marine API, average 2015-2024, checked October 8, 2026
- sunrise-sunset.org, sunrise and sunset calculated for the 15th of the month, checked October 8, 2026
- U.S. Department of State, Costa Rica Travel Information, Safety and security (https://travel.state.gov/content/travel/en/international-travel/International-Travel-Country-Information-Pages/CostaRica.html), checked October 8, 2026
- U.S. Department of State, Costa Rica Travel Advisory, issued April 1, 2026 (https://travel.state.gov/content/travel/en/traveladvisories/traveladvisories/costa-rica-travel-advisory.html), read via the State Department open data API on October 8, 2026