Dry season in Costa Rica: what it is, when it hits, and how it changes your trip

What is the dry season in Costa Rica?

It is the half of the year when the Pacific coast and the Central Valley get little or no rain, running roughly from December to April. Costa Ricans do not call it “dry season” in conversation — they call it summer, even though it falls in December.

Costa Rica does not have four seasons, it has two: the dry one and the green one. The dry season is near-guaranteed sun and clear skies; the green season is the rainy one, from May to November. So when a local mentions “summer,” they mean January, not July. We lay the whole calendar out in when to visit Costa Rica.

When is the dry season in Guanacaste?

December through April, the same as the rest of the Pacific side, but in Guanacaste it is the most pronounced in the country. March and April are the hottest, driest months: the forest drops its leaves and the grass turns yellow.

Guanacaste is the extreme of the extreme. Where the dry season feels pleasant and mild in San José, here the sun really bears down. By March, dust from the gravel roads gets into everything you own, and the midday heat of the dry tropical forest is not an exaggeration — it is the kind of heat that makes you slow down and carry water. We are not saying this to scare you; we are saying it so you pack right.

What is El Niño and how does it change the trip?

El Niño is a warming of the Pacific Ocean that recurs every few years, and in Costa Rica it deepens the drought precisely on the Pacific side. In an El Niño year, Guanacaste is the region that feels the dry season most — less rain still, for longer.

The strange part is that the phenomenon works in reverse on each coast. El Niño dries out the Pacific while, at the same time, it tends to bring more rain to the Caribbean. The two halves of the country live the same event in opposite ways.

Here is the honest bit: we will not forecast the weather for you. The agency that tracks it is Costa Rica’s national weather institute, the IMN, which publishes an El Niño bulletin on the second Friday of every month. In August 2026, the IMN was reporting a strengthening El Niño and a rainfall deficit in the northern Pacific. To see how things stand in the month you travel, check the current bulletin at imn.ac.cr/enos: that is today’s data, not the snapshot we had when we wrote this.

Does it rain at all in Guanacaste during the dry season?

Very little, which is exactly why the landscape changes so much. In the depths of the dry season, weeks can pass without a drop, and an El Niño year stretches that even further.

That cuts both ways. The upside: near-guaranteed sun for the beach, clean skies, and firm roads that turn rough in the green season. The downside: rivers run low, some waterfalls lose their force, and the lush green you see in Costa Rica photos is not March — it is the rainy season. If you are coming for dense jungle and full rivers, the dry season is not your time; if you are coming for beach and sun, it is precisely your time.

Does the Caribbean have a dry season too?

Yes, but on a different calendar, and that one sentence can save a vacation. The Caribbean’s driest stretch falls around September and October — exactly when the Pacific is at its wettest of the year.

So there is no single “dry season” for the whole country. When Guanacaste is having its best weeks of sun, the Caribbean can be underwater, and vice versa. If your trip can shift coasts, you have room to pick whichever side is dry in your month. It is spelled out in Pacific or Caribbean.

What should you pack for the dry-season heat in Guanacaste?

Water, real sun protection, and light clothing — the March and April heat in Guanacaste is not up for negotiation. Bring a bottle you can refill and drink from it even when you are not thirsty, because dry heat fools you.

The basics people underestimate: a hat or cap, sunscreen that survives sweat, sunglasses, and sandals that can take the gravel dust. If you plan to drive dirt roads, expect them dry and dusty, not muddy. And start hikes early: between about 10 a.m. and 2 p.m., the inland Guanacaste sun is for finding shade, not for walking under.

Does the trip cost more in the dry season?

Yes — the dry season is high season and it shows — but the big difference is not between months, it is between three or four weeks of the year and all the rest. Christmas, New Year, and Easter week are the expensive weeks, because the whole country travels then too.

That is where a move few visitors hear about comes in: staying inland. The Guanacaste coast — Tamarindo, Flamingo, the Papagayo Gulf — is among the priciest in the country, but an hour or so inland, lodging and food cost what they cost in a small town. You can spend the day at the beach and sleep cheap away from it. That is the whole idea behind where to stay near Liberia.

Is it worth visiting Guanacaste in the dry season?

If you come for sun and beach, it is the best time of year — which is why it is the busiest. If you come for green landscapes and full rivers, the rainy season will suit you better.

And there is a Guanacaste the dry season does not switch off: the inland one. The Miravalles volcano and its hot springs, the Llanos de Cortés waterfall, the Palo Verde wetlands where thousands of water birds gather at the height of the dry season. It is the part of the country almost nobody visits, and summer is its best moment. We show you where to start in the Miravalles volcano and its hot springs and on the Bagaces page — or search by what you want to do under experiences.