Costa Rica’s weather is wonderfully simple in theory and delightfully complicated in practice. The country has just two seasons — dry and green (rainy) — rather than four, but its mountains and two coastlines create a patchwork of microclimates that can have one region basking in sun while another is soaked in afternoon rain. Understanding this rhythm is the key to timing your trip well, whether you are chasing guaranteed beach weather, green-season bargains, turtle nesting or the best wildlife viewing. This month-by-month guide breaks down what to expect across the year and region by region, so you can pick the perfect time to go — and use Costa Rica’s flexibility to chase the sun if the weather turns.
The two seasons explained
Costa Rica’s year divides into the dry season (roughly December to April) and the green season, also called the rainy or low season (roughly May to November). The dry season brings sunshine and is the high-tourism period; the green season brings regular rain — usually as afternoon downpours after clear mornings — along with lush landscapes, lower prices and thinner crowds. Costa Ricans often call the dry season verano (summer) and the green season invierno (winter), regardless of the calendar. Crucially, “rainy season” rarely means all-day rain; mornings are frequently bright, which is why green-season trips can be excellent with a little planning.
Month by month
- December–February: peak dry season — sunny, breezy, busy and the priciest months, especially around the winter holidays. Superb beach weather.
- March–April: the hottest, driest stretch on the Pacific; Easter (Semana Santa) is a major local holiday with crowds and closures.
- May–June: green season begins — lush, quieter, good value, with clear mornings and afternoon showers.
- July–August: a partial dry spell known as the veranillo (“little summer”) brings some drier weeks; popular for family travel.
- September–October: the wettest months on the Pacific — but often the sunniest and best time to visit the Caribbean.
- November: the green season winds down — lush, increasingly clear and excellent value before the December crowds.
Region by region
Microclimates mean the season plays out differently across the country:
- Guanacaste & Nicoya (northwest Pacific): the driest, sunniest region, with reliable sun and a pronounced dry season — the safest bet for beach weather.
- Central & South Pacific (Manuel Antonio, Osa): wetter and greener, especially in September–October, but gorgeous and lush.
- Caribbean (Tortuguero, Puerto Viejo): marches to its own beat, with no clear dry season and frequently sunny spells in September–October when the Pacific is wettest.
- Central Valley & highlands (San José, Arenal, Monteverde): cooler year-round; the cloud forest is misty in any season, and Arenal is often cloud-wrapped.
Best time for sun and beaches
If your priority is guaranteed sunshine and beach time, the dry season (December–April) is the clear winner, with Guanacaste’s Gold Coast the most reliable region of all. These months deliver day after day of blue skies, ideal for surfing, sailing and lounging — at the cost of higher prices and bigger crowds. The shoulder months of late November and early December, and the July–August veranillo, can offer a sweet spot of good weather with slightly fewer people. If the Pacific is rainy during your dates, remember the Caribbean often enjoys its best weather then. See the best beaches guide.
Best time for wildlife and nature
Wildlife viewing is rewarding year-round, but timing helps for specific sightings. Sea turtles: green turtles nest at Tortuguero from July to October; leatherbacks at Playa Grande roughly October–March; and olive ridley arribadas at Ostional mostly in the green season. Quetzals: best in Monteverde and the highlands during breeding season, February–July. Humpback whales: visible off the South Pacific (Marino Ballena) across two seasons, roughly December–April and July–November. Birds and amphibians: the green season’s rains bring lush growth and active frogs. See our wildlife watching guide and national parks guide.
Best time for value and fewer crowds
Budget-conscious and crowd-averse travellers should look hard at the green season, especially May, June and November. Accommodation rates drop, popular spots are quieter, and the landscapes are at their most vivid and green. The trade-off is afternoon rain and, in September–October on the Pacific, more persistent wet weather. But with clear mornings the norm, a green-season trip that front-loads activities into the morning and keeps afternoons flexible can be both rewarding and far better value. November in particular is a hidden gem — lush, increasingly dry and ahead of the December price surge. See the green season guide.
Flying around the weather
One of Costa Rica’s underrated advantages is that its coasts can have opposite weather on the same day — and charter flights let you take advantage. If the South Pacific is socked in during October, the Caribbean or the drier northwest may be sunny, and a short flight repositions you in well under an hour. This flexibility is especially valuable in the green season, turning the weather’s unpredictability from a problem into an opportunity. Flying also avoids the green season’s muddiest, most flood-prone road sections. See getting around Costa Rica and flying vs driving.
So when should you go?
The short answer: for guaranteed sun and peak conditions, go December–April and book early; for value, lush scenery and fewer crowds, go May, June or November; for the Caribbean, target September–October; and for specific wildlife, time your trip to the relevant nesting or breeding season. There is genuinely no bad time to visit Costa Rica — only trade-offs between sun, crowds, price and what you most want to see. Decide your priorities, pick your window, and let short flights help you chase the best weather across regions. See the best time to visit for a deeper verdict, then request a flight to plan your routing.
Holidays and busy periods to know
Beyond the weather, a few calendar dates affect crowds and prices. The Christmas-to-New-Year period and Easter week (Semana Santa) are the busiest of the year, when Costa Ricans themselves travel domestically — beaches fill, prices spike and some businesses close for Semana Santa, so book far ahead and expect company. The July–August window is popular with North American and European families on summer break. By contrast, the green-season months outside these peaks — especially May, June, September, October and November — are quieter and better value. Aligning your trip with or against these dates, depending on whether you want buzz or solitude, is as important as the rain pattern.
Final verdict on timing
Costa Rica is a genuinely year-round destination, and the “best” time depends entirely on your priorities. Want certain sun and lively beaches? Come in the dry season and book early. Want lush landscapes, value and fewer people? The green season — particularly the shoulders of May–June and November — is hard to beat, with clear mornings and the flexibility to chase sun between coasts. Whatever you choose, build mornings around your key activities, keep afternoons flexible in the wet months, and use short flights to reposition if the weather turns. See the best time to visit, and when your dates are set, request a flight.
Temperature and what to pack by climate
Costa Rica’s temperatures vary more by altitude than by month. The coastal lowlands stay hot and humid year-round, typically 27–35°C by day; the Central Valley and mid-elevations are mild, around 22–28°C by day and cooler at night; and the highlands and cloud forests are genuinely cool, sometimes dropping to single digits at night in the mountains. This means you should pack layers regardless of when you visit: light, quick-dry clothing for the lowlands, a warm layer for the highlands, and rain protection year-round but especially in green season. See our full packing list for climate-specific advice that keeps you comfortable across Costa Rica’s many microclimates.
Planning around the weather with flights
The smartest weather strategy in Costa Rica is to stay flexible — and flying gives you that flexibility. Because the Pacific, Caribbean and northwest can have entirely different conditions on the same day, the ability to reposition by a short charter flight lets you chase the sunshine rather than being stuck under a rain cloud. In the green season especially, this turns the weather’s unpredictability into an advantage: if the South Pacific is wet, hop to the drier Guanacaste coast or the often-sunny Caribbean in under an hour. Flying also sidesteps the green season’s muddiest, occasionally flooded roads. Build a weather-resilient trip by keeping mornings active and using short flights to follow the best conditions.
A month-by-month quick reference
To summarise: December–April is the dry, sunny, peak season — best for guaranteed beach weather, worst for crowds and prices. May–June opens the green season with lush scenery, value and clear mornings. July–August brings the veranillo dry spell and family-friendly travel. September–October is wettest on the Pacific but prime time for the Caribbean. November is a lush, increasingly dry, excellent-value sweet spot before the December rush. Match this calendar to your priorities — sun, value, crowds or wildlife — and you will pick the right window. For the definitive verdict, see the best time to visit Costa Rica.