Early on August 2, the roads east of San Jose fill with walkers carrying water bottles, small statues and umbrellas, all heading toward the basilica in Cartago. Back in the capital, the afternoons turn gray on schedule, the rain drums on the tin roofs, and the cafés fill with people ordering one more cup of coffee. August is the green month in the Central Valley, a time for volcano mornings, market lunches and a city that carries on at its own pace.
What is the weather like in San Jose in August?
San Jose in August stays mild and damp, with temperatures up high feeling like spring and rain falling most days, typically in the afternoon.
| Month | Average high (°F) | Average low (°F) | Rain days |
|---|---|---|---|
| July | 75.3 | 64.4 | 22.6 |
| August | 75.4 | 64.2 | 23.9 |
| September | 75.3 | 63.8 | 26.2 |
Mornings are the best part of the day. The air is fresh, the sky is often clear or softly hazy, and the hills around the valley look deep green. This is when you want to be out walking, visiting a market or heading up to a volcano, because clouds tend to build over the mountains by lunchtime.
Afternoon is when the rain typically shows up, at times in the form of a brief heavy shower and at other times as a lingering gray mist that stretches into the evening. A few days bring a real soaking, but plenty of days are dry until the middle of the day. Because San Jose sits high in the Central Valley, the rain feels cool rather than tropical.
A light sweater or a thin jacket feels right once evening comes, above all following a storm. In mid-August, you get roughly twelve and a half hours of daylight, which means darkness falls by early evening. There is no sea in San Jose, and the Pacific and Caribbean coasts each have their own rhythms, so beach plans are best treated separately from the capital.
What to do in San Jose in August
The big date of the month is August 2, when hundreds of thousands of Costa Ricans walk on pilgrimage to the Basilica of Our Lady of the Angels in Cartago. Many set out from San Jose and other towns the night before, and the roadsides fill with families, volunteers handing out water and food, and people who walk the last stretch on their knees. Even if you do not join, the mood across the country that day is quiet and devout, and the Cartago area is crowded.
August 15 is Mother’s Day, a national holiday, and it shapes the whole week around it. Families gather for long lunches, restaurants fill up with big tables, and flower sellers line the streets. If you want to eat out that day, expect the popular places to be busy, and look at it as a chance to see how Costa Ricans celebrate at home.
The green season suits indoor cultural stops very well, and San Jose has plenty of them. The central market is a good place for a casado (a plate of rice, beans, plantains, salad and a protein), a cup of local coffee and a wander among stalls selling spices, leather and souvenirs. The downtown pedestrian streets, the Teatro Nacional with its café, and the museums of gold and jade give you a full day that does not depend on the sky.
Poas and Irazu volcanoes
Poas and Irazu are the two classic day trips by road from San Jose. Poas draws visitors with its smoking crater and the surrounding cloud forest, whereas Irazu climbs to a greater height and offers a barren, nearly moonlike expanse of ash and stone. Poas and Irazu are classic day trips by road from San Jose.
In August, go as early as you can. Mornings give you the best chance of seeing into a crater, though clouds can close in at any hour and nothing is guaranteed. Bring a layer, because the summits are much colder than the city. Before setting out, check each park’s official page for current access rules.
These trips suit travelers who like landscapes and fresh air more than long hikes. If the summit is wrapped in cloud, the coffee farms and small towns on the way down still make the outing worthwhile.
Coffee farms and Cartago
Coffee farms define the hills surrounding San Jose, and a farm visit ranks among the nicest things to do during the rainy season. Strolling between the bushes, you find out how the beans get picked, dried and roasted, and wrap up with a tasting. In August the plants are lush, and the harvest itself comes later in the year, so you see the green side of the cycle.
Cartago, the old colonial capital, is a natural pairing with a coffee or volcano day. Its basilica, with a famous small statue of the Virgin, is the pilgrimage destination of August 2, and the building and its plaza are worth a stop on any day of the month. Ruins of an unfinished church sit nearby, a garden-like space that is lovely in soft, damp light.
Combine the two for a relaxed day, with a farm visit in the morning and the basilica in the afternoon. It suits families, slow travelers and anyone who likes to see how a place makes its famous export.
For food, August is a month for warm dishes. Look for sopa negra (black bean soup), olla de carne (a beef and vegetable stew), and fresh tamales, plus agua dulce or a hot chocolate when the afternoon rain starts. Late in the day, the neighborhood sodas (small family restaurants) are cozy places to wait out a storm.
Evenings in the city are low-key. You can catch live music in a bar, a play or concert at a theater, or just linger over dinner. The mood is local and relaxed, and because the rain thins out the crowds on the street, restaurants feel calm.
A two-day itinerary for San Jose in August
Day 1 is for the volcano and the valley. Leave early in the morning for Poas, when the sky has its best chance of being open. Stop for strawberries or a hot chocolate on the way down, then have a late lunch in one of the valley’s roadside restaurants, where a casado or a bowl of soup hits the spot.
Return to the city by mid-afternoon, just as the rain usually sets in. Use the wet hours for a museum or the Teatro Nacional café, where you can sit with coffee and watch the street. In the evening, have dinner in a neighborhood restaurant, and be back at the hotel early since the sun sets by early evening.
Day 2 heads east to Cartago and the coffee hills. Start with a coffee farm tour in the morning, when the air is fresh and the hills are clear, then continue to the basilica and the ruins nearby for the middle of the day. Lunch can be a simple soda meal in town.
In the afternoon, come back to San Jose and spend the rainy hours at the central market, shopping for coffee, spices and crafts, or browsing the gold and jade museums. If the weather stays dry, walk the pedestrian streets downtown. Finish with a relaxed dinner and, if you like, live music, before an early night.
Is San Jose busy in August?
San Jose is moderately busy in August, with surges around the two big national dates and quieter stretches in between.
The pilgrimage on August 2 brings enormous crowds to Cartago and its roads, so any day trip in that direction needs patience, and buses and traffic can be heavy. Mother’s Day on August 15 fills restaurants with family groups, so tables go quickly.
Outside those days, the green season is calmer than the dry months. Rooms are easier to find, popular attractions feel less packed, and rental cars are generally easier to arrange. Still, it is a good habit to book early for the days around the pilgrimage and Mother’s Day, and later for the quiet weeks in between.
Before you make plans for volcanoes or other national parks, look at the park’s official page, because rules for reservations and access may change.
What to pack for San Jose in August
Pack for mild days, cool evenings and afternoon rain, with layers you can add or remove as you climb into the hills.
- A light rain jacket, because showers arrive most afternoons.
- A compact umbrella for walking around the city between storms.
- A warm layer or fleece for the volcano summits and cool evenings.
- Shoes with good grip, since wet sidewalks and trails get slippery.
- Bring sunscreen and a hat, as the sun at high elevation is strong in the morning.
- To keep a camera or phone safe, bring a dry bag or a little cover for your daypack.
Good to know before you go
The U.S. State Department rates Costa Rica Level 2, ‘Exercise increased caution,’ due to crime; it says petty crime is common throughout Costa Rica and that violent crime also affects tourists, including armed robbery, homicide and sexual assault.
August falls inside the Atlantic hurricane season, so it is worth keeping an eye on forecasts, though San Jose’s main weather story this month is simply the daily rain. Before traveling, consult official Costa Rican entry guidance about passports, proof of onward travel and permitted length of stay. For getting around, the capital works as a base for day trips by road, and the two big dates, August 2 and August 15, are the ones to plan around first.
San Jose in August vs July and September
Moving a month earlier to July changes little in the weather, since temperatures are nearly the same and the rain is just a touch lighter. July tends to feel a bit more relaxed, with fewer big national dates, and some travelers like the slightly better odds of drier mornings. You miss the August 2 pilgrimage and the Mother’s Day weekend, which is a plus or a minus depending on your taste.
Moving a month later to September brings the wettest stretch of the green season, with more rainy days and heavier totals. Afternoons are grayer and longer, and some outdoor plans get rained out more often. The upside is a quiet, uncrowded city and a deeply green countryside.
If you want the pilgrimage or a Mother’s Day lunch, stay with August. If you want the best odds of clear morning views at the volcanoes, July is the safer pick. If you prefer quiet and do not mind the rain, September works.
Is August a good time to visit San Jose?
August works well for visitors who like lush scenery, museums and other cultural sites, and a laid-back capital city, and who do not mind building their plans around rain that falls in the afternoon.
It is less ideal for travelers who need guaranteed sunshine or who want a long, uninterrupted beach vacation, since the capital has no sea and the weather here favors mornings.
On arrival, plan your volcano or Cartago day first, while the morning forecast cooperates, and leave the city sights for the wetter afternoons. What makes August special in San Jose is its mix of devotion and family warmth, from the walkers heading to Cartago on August 2 to the crowded lunch tables on Mother’s Day.
Sources
- Open-Meteo / ECMWF ERA5, normals 1991-2020 computed for the grid cell at 9.9281N 84.0907W, 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 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