Costa Rica Weather: Dry Season, Rainy Season and Regional Differences

Costa Rica does not have one nationwide weather calendar. The Pacific coast has a clear dry-and-rainy pattern, La Fortuna sits in a wetter Northern Plains climate influenced by the Caribbean, and the Caribbean coast has its own relatively dry windows.

That is why a forecast or season label for “Costa Rica” can be technically true and still be unhelpful for your exact route.

The short version

For many first-time trips:

• Pacific side: the clearest dry-season core is roughly December through March, with April transitioning wetter;
• green/rainy season: rain becomes more frequent from May, with September and October especially wet on much of the Pacific side;
• La Fortuna / Northern Plains: rain is possible year-round and February through April are relatively drier rather than reliably dry;
• Caribbean coast: there is no strong Pacific-style dry season; relatively drier periods often occur around February–March and September–October;
• Monteverde: elevation and cloud forest mean cooler, mistier conditions than the lowlands even when another stop is sunny.

Use those patterns for planning, not as a promise for a particular afternoon.

Pacific coast: the most recognizable season pattern

Costa Rica's official tourism climate guidance describes the Pacific side as having a well-defined dry and rainy cycle.

December to March is the main dry period, April is transitional, and wetter conditions dominate from May into the later part of the year. September and October are among the wettest Pacific months.

Rain in the wet season often builds later in the day, which is why an early national-park or beach plan can still work well.

For our route, this matters most around Manuel Antonio, which sits in the Central Pacific.

Manuel Antonio is wetter than the driest northwest

Do not use a Guanacaste beach forecast as a proxy for Manuel Antonio.

Official Central Pacific climate information describes the region around Quepos and Manuel Antonio as tropical and comparatively wet, with a short/moderate dry season and heavier rainfall farther south.

January through March are the clearest dry-season months for this area. April transitions toward the rains.

That means a February Manuel Antonio trip is statistically different from a September one, but neither comes with a weather guarantee.

La Fortuna: expect rainforest weather

La Fortuna sits in Costa Rica's Northern Plains.

Official climate guidance places this region in the Caribbean precipitation regime, with rainfall throughout the year and a relative decrease in February, March and April. The rainy period becomes more established from May and continues toward the end of the year.

This is the planning mistake to avoid: “I am visiting in dry season, so Arenal will be dry.”

It may be sunnier and comparatively drier, but rain gear still belongs in your daypack.

Monteverde: altitude changes the experience

Monteverde is a cloud-forest destination at much higher elevation than the beaches or La Fortuna town.

Cloud, mist, wind and cooler evenings are part of the environment. Even in a favorable travel month, you should bring a light waterproof layer and something warmer for evenings.

A rainy-looking Monteverde day is not necessarily a failed day. Moisture is part of what creates the ecosystem you traveled there to see.

Caribbean: a different calendar

The Caribbean side does not follow the Pacific pattern cleanly.

Official tourism climate information describes rain through the year with relatively drier periods around February–March and September–October. The latter is especially important because September and October are very wet months on much of the Pacific side.

This regional contrast is why “September is the worst month for Costa Rica” is too broad to be useful.

Where you are going matters as much as the month.

Costa Rica weather by month: a practical first-trip view

January–March

Strong months for a Pacific-focused first trip. Expect more sunshine on the Pacific side, but still carry rain protection for Arenal and Monteverde.

April

A transition month on the Pacific side. It can still be attractive, but the chance of rain begins to increase.

May–June

Green-season conditions become established. Landscapes are lush, afternoon showers are more common, and you should build more flexibility into outdoor plans.

July–August

The Pacific can experience a relative reduction in rainfall sometimes called veranillo or “little summer,” but this is not a second guaranteed dry season.

September–October

Typically the wettest period for much of the Pacific side. Caribbean conditions can be comparatively favorable at the same time.

November

A transition month in many Pacific areas. Conditions can vary substantially by region and year.

December

The Pacific begins moving into the drier part of the year, but the timing of that transition is not identical everywhere.

Does rain ruin a Costa Rica trip?

Usually not, if the itinerary is designed for it.

A good rain-aware plan:

• starts priority outdoor activities earlier when practical;
• uses quick-drying clothes rather than heavy cotton;
• protects phones and cameras;
• avoids scheduling every transfer and tour with zero buffer;
• accepts that tropical rain can be intense and brief rather than an all-day event;
• keeps one flexible block in each destination.

Rain becomes a bigger problem when your plan requires perfect weather every day.

What should you pack?

For our 10-day route through La Fortuna, Monteverde and Manuel Antonio:

• light breathable clothes;
• waterproof shell;
• quick-drying walking clothes;
• closed shoes with grip;
• sandals or lighter footwear for the coast;
• small dry bag or waterproof phone protection;
• light layer for Monteverde evenings;
• reusable water bottle;
• sun protection.

You do not need expedition equipment. You do need clothing that can handle heat, humidity and a sudden shower.

Weather vs the best time to visit

This page is about what the climate does.

Our best time to visit Costa Rica guide answers a different question: when should you go given crowds, route, wildlife interests and tolerance for rain?

Those are not the same intent, and keeping them separate makes planning easier.

Weather on our 10-day route

Use the Costa Rica route map to see why one trip crosses several weather environments.

La Fortuna is wetter and rainforest-influenced. Monteverde is cooler and cloudier because of elevation. Manuel Antonio is hot Central Pacific coast with a stronger seasonal rainfall pattern.

Pack for all three rather than dressing for the first forecast you see.