Quick answer: December–April for guaranteed sun and beaches; May–November for lush landscapes, wildlife and lower prices. November and May are the sweet spots if you want both. Below: what each month actually delivers, from a naturalist guide based in Guanacaste year-round.
When should you visit Guanacaste? It’s the question every traveler asks when planning a Costa Rica trip, and the answer is more nuanced than most guides admit.
Planning to see more of the country? The best time varies by region — read our guide to the best time to visit Costa Rica by region.
Guanacaste, on Costa Rica’s Pacific coast, experiences two distinct seasons: the dry season (December–April) and the green season (May–November). But here’s what most travel blogs won’t tell you: both seasons are worth visiting. The difference isn’t “good” or “bad”—it’s about matching the season to the experience you want.
As private tour operators based in Guanacaste for years, we’ve guided travelers in every month. We’ve seen families thrive in the dry season heat, and we’ve witnessed couples fall in love with the lush, quiet green season. The best time to visit Guanacaste isn’t a calendar date—it’s the season that aligns with your priorities: weather certainty, budget, crowds, or the specific experiences you’re after.
The Dry Season (December–April): Sunshine & Crowds
Weather: Clear skies, minimal rain, warm temperatures (27–31°C / 80–88°F).
Crowds: Peak season. Expect higher prices and more tourists, especially December–January and around Easter.
Best for: First-time visitors, beach lovers, families wanting predictable weather, anyone nervous about rain.
Why the dry season wins for some travelers
If you’re worried about weather ruining your plans, the dry season removes that anxiety. You’ll have long sunny days, calm seas for water activities like a private catamaran day, and reliable conditions for hiking, ziplining, and outdoor adventures — the dry, dusty trails are ideal for an ATV & buggy off-road adventure. It’s also prime time for private bird watching, when wildlife concentrates around the few remaining waterholes. The beaches are swimmable, and the sun sets dramatically every evening.
- December–January: The sweet spot of high season. Warm, dry, vibrant with holiday energy. Book early—this is peak.
- February–March: Still excellent. Slightly less crowded than December, but still popular. Weather remains reliable.
- April: The tail end of dry season and the hottest month. Temperatures peak (up to 35°C / 95°F), but it’s perfect for beach days. Toward late April, the first afternoon showers hint at the green season’s arrival.
The dry season is expensive. Hotels charge peak rates, tours fill quickly, and you’ll share popular spots with other tourists. If you’re budget-conscious or prefer solitude, this season comes with a cost.
The Green Season (May–November): Lush, Quieter, and Underrated
Weather: Afternoon showers (usually brief), mornings often sunny, temperatures warm and humid (25–30°C / 77–86°F).
Crowds: Low season. Fewer tourists, better prices, quieter experiences.
Best for: Nature lovers, photographers, budget travelers, wildlife enthusiasts, couples seeking intimacy.
The truth about rain in the green season
Here’s what guides rarely say: the green season doesn’t mean all-day rain. In Guanacaste, the typical pattern is sunny mornings and afternoon showers—often brief thunderstorms that cool everything down, not day-ruining downpours.
If you plan activities for the morning (which smart travelers do), you get full days of exploration. The afternoon rain? It’s actually a feature, not a bug. The landscape explodes into green. Rivers run full and dramatic. Wildlife is more active. Waterfalls are at their most spectacular.
- May–June: The shoulder season into green. Mornings are mostly sunny, rain increases gradually. Prices drop. Great balance of weather and value.
- July–August: Peak green season. Lush, vibrant, fewer crowds. Some afternoons have heavier rain, but mornings are solid. Waves pick up—surfers love these months.
- September–October: The greenest and wettest months. Rain can be more significant, but the landscape is at its most alive. Wildlife thrives. Prices are lowest. For adventurous travelers, this is magical.
- November: Transition month. Rain begins to ease, prices are still low, and the country is recovering from September’s heaviest rains. Underrated month.
You’ll have trails, attractions, and restaurants largely to yourself. Prices drop 30–50% compared to dry season. The country feels more authentic—you’re not on a conveyor belt of tourists. And if you’re into wildlife, the green season is prime time. Birds sing more. Monkeys are more active. Up in the Tenorio rainforest, two hours north, it’s the best season to look for sloths on our Sloth & Waterfall Rainforest Combo, when the forest is at its lushest and the waterfalls run full. Even the off-road trails change character: that same ATV run turns to mud and, honestly, gets more fun. Rain brings life.
Guanacaste Month by Month
January in Guanacaste
January is the month of the wind — the northern trade winds arrive and bend everything to them, thinning the dry forest and shrinking the wetlands. The same wind drives the Papagayo Upwelling offshore, and as the wetlands recede the waterbirds concentrate: wood storks, herons, migrants and the towering jabiru. Northern humpbacks are in the bays with their calves, and in the lowlands the raptors hunt behind the cane machines of the zafra. It’s peak season and costs double the green months — but for guaranteed sun, January delivers.
Read the full guide to Guanacaste in January →
February in Guanacaste
The driest, sunniest month of the year — close to ten hours of sun a day and rainfall measured in single millimetres. The trade winds are still blowing, the sea stays cool from the Papagayo Upwelling, and the landscape is golden rather than green.
That bare dry forest is February’s real gift: with the leaves down, you can finally see, which makes this the best month of the year for wildlife photography. Palo Verde reaches its peak too, with up to 80,000 birds crowded into the shrinking Tempisque wetlands. The northern humpbacks are offshore with their calves, and the last leatherbacks are nesting at Playa Grande.
The trade-off is price: this is peak season, and it costs double the green months.
Read the full guide to Guanacaste in February →
March in Guanacaste
March is the peak of the dry season — relentless sun, no rain to speak of, rivers and waterfalls at their lowest. But the wind dies down, and the heat is manageable in a way rain never is: it’s the month of guaranteed-dry certainty, which is why couples choose it for weddings. It’s also a safari — as the water holes shrink, monkeys, deer, coatis and birds come to what water is left. The dry forest is bare and flowering at once, the best dry-season wildlife concentration of the year.
Read the full guide to Guanacaste in March →
April in Guanacaste
April is the turning point — the hinge between the dry and green seasons. It’s the hottest stretch of the year, rivers and waterfalls at their lowest, the hills their most golden — and then, usually in the last days, the first rains arrive to break the heat. The dry forest works its quiet miracle, pushing out bright new leaves before a drop falls. It’s the last window for the northern humpbacks heading out, and February–March wildlife visibility largely holds. One honest heads-up: when Semana Santa lands in April, the popular beaches saturate — exactly the week a local guide earns their keep.
Read the full guide to Guanacaste in April →
May in Guanacaste
May is the switch. After five months of dry, the first real rains arrive — here on the north coast, among the last regions in the country. But this is the least rainy corner of Costa Rica, and the rain keeps a schedule: bright mornings, a warm afternoon shower, done. Within weeks the golden, bare forest turns deep green and the whole province goes luminous. The forest wakes all at once — May beetles, hatching garrobos, frogs filling the night — and guava and mango draw the monkeys. High season is over, so crowds thin and prices drop by a third or more, right as the land turns its most beautiful.
Read the full guide to Guanacaste in May →
June in Guanacaste
By June the green season is fully settled — but here, the least rainy corner of Costa Rica, “rainy” keeps a schedule you can plan around: bright mornings, an afternoon shower, done. Its secret is the Veranillo de San Juan, a short sunny break around June 24th when the trade winds return and the rains pause. The forest is fed and full of life, and the rivers wake up — where March shrank the waterfalls to a trickle, June brings them roaring back, and Río Celeste reaches its deepest turquoise. High season is long over: thin crowds, low prices, the land at its greenest.
Read the full guide to Guanacaste in June →
July in Guanacaste
July is green season with an asterisk — one of the driest stretches of the whole “rainy” calendar. Around mid-month comes the canícula, a longer sunny window that some years nearly joins June’s Veranillo: green landscape, much of the sunshine. The corn planted in June comes in now, and the roadsides fill with fresh elote. The forest is deep green and fed, the rivers still full, and offshore the turtle arribadas begin. It’s the province’s proudest month, too — July 25th is Día de Guanacaste, and Liberia holds the biggest celebrations. Green, sun, culture and value all at once.
Read the full guide to Guanacaste in July →
August in Guanacaste
By August the green season is in full swing — and it’s one of our favourite months to guide. When February and March push past 35°C, August sits at a fresher 30°C: humid, but gentler than the first hard rains of May and June. The forest is at its richest — dense canopy, thunderous waterfalls, howlers, capuchins, blue morphos — and, two hours north in the Tenorio rainforest, the sloths we go looking for. The turtle arribada scales up from tens of thousands into the hundreds of thousands, and from about August the southern humpbacks reach our Gulf of Papagayo. Low prices, thin crowds, the forest and rivers at their fullest.
Read the full guide to Guanacaste in August →
September in Guanacaste
Let’s be honest: September is the rainiest month of the year — but two things make it one of the most rewarding on the calendar. First, “rainiest” here still means Guanacaste, the driest region in the country: workable mornings, rain in the afternoon, a cooler 25°C, and — because most visitors stay away — empty beaches, the lowest prices of the year, and a forest at its most electric green. Second, this is peak wildlife: the great turtle arribada builds toward its yearly maximum, and September opens the autumn bird migration. Add the most heartfelt Independence Day on the calendar, and September rewards the traveller who’s in on the secret.
Read the full guide to Guanacaste in September →
October in Guanacaste
October is the second rainiest month of the year, just behind September — and the rain is the reason to come, not to stay away. Rain on the rainforest and the savanna turns the whole landscape magical, the forest at its deepest green, the rivers high, almost no one else there to see it. It’s the low point of the tourist year: lowest prices, emptiest trails, some places closed. But nature delivers like no other month — the turtle arribada hits its yearly maximum, the leatherback nesting season opens at Playa Grande, and overhead the raptor migration peaks with millions of hawks streaming south. It asks the most and gives the most back.
Read the full guide to Guanacaste in October →
November in Guanacaste
If May is the door into the green season, November is the door back out — and one of the most quietly rewarding months of the year. The rains drop off sharply, our coast is the first in the country to dry out, and the sunsets turn spectacular. You get the best of both seasons at once: the forest still lush and green, the waterfalls still full, Río Celeste still glowing — but the sun coming out more and the mornings turning reliable. Crowds still gone, green-season prices still in effect, the wildlife — birds and turtles both — still rich. For green landscapes, working weather and low prices in one trip, November is arguably the sharpest value on the calendar.
Read the full guide to Guanacaste in November →
December in Guanacaste
December is where the year comes full circle. The northern trade winds return — the same Papagayo winds that define January — and the dry season with them: clear skies by mid-month, the forest turning gold. Offshore the northern humpbacks come back to calve, and December–January is the peak of the leatherback season at Playa Grande. In the fields the zafra begins. It’s the warmest month in every sense — Christmas, tamales, marimba — with two faces: calm and affordable the first three weeks, then the busiest, priciest stretch of the year from the 20th to New Year’s.
Read the full guide to Guanacaste in December →
Best for beaches: December–April (dry season).
Best for wildlife: May–November (green season—animals are more active and visible).
Best for waterfalls: May–November (water volume is dramatic).
Best for hiking: December–April (no mud, clear views).
Best for surfing: July–November (bigger swells arrive).
Best for budget: September–October (lowest prices, though highest rain).
Best for mix of activities: May–June or November (shoulder seasons—good weather, manageable crowds, reasonable prices).
Guanacaste by the Numbers: Temperature & Rainfall
| Month | Avg. High | Avg. Low | Rain | Vibe |
|---|---|---|---|---|
| December | 31°C | 23°C | Very little | Peak season starts |
| January | 31°C | 22°C | Almost none | Dry and windy, busiest |
| February | 31°C | 22°C | Least of the year | Driest and sunniest, less crowded than January |
| March | 32°C | 23°C | Almost none | Hot, dry, Easter crowds |
| April | 33°C | 24°C | First showers, late in the month | Hottest month of the year |
| May | 31°C | 24°C | Afternoon showers | Green season begins, refreshing |
| June | 31°C | 24°C | Daily afternoon rain | Lush, afternoon rains |
| July | 31°C | 23°C | Afternoon rain, drier mid-month | Green, surfers arrive |
| August | 31°C | 23°C | Daily afternoon rain | Peak green, active wildlife |
| September | 30°C | 23°C | Heaviest of the year | Greenest, wettest, cheapest |
| October | 30°C | 23°C | Heavy, easing late in the month | Still green, second wettest, quietest |
| November | 30°C | 23°C | Light, clearing | Transition, fewer tourists, good weather |
The Honest Answer: When Should You Visit?
Choose the dry season (Dec–Apr) if: it’s your first time in Costa Rica and weather certainty matters; you have young children and want predictable conditions; you’re a beach person; or you don’t mind paying peak prices.
Choose the green season (May–Nov) if: you want to see the “real” Costa Rica—lush, alive, quieter; budget matters; you love wildlife and nature photography; you’re flexible with afternoon showers; or you want authentic, less-touristy experiences.
Choose the shoulder season (May–June or Nov) if: you want the best of both—decent weather, fewer crowds, and reasonable prices.
Our Philosophy: Every Season Has Magic
At Guanadreams CR, we design private experiences around the season you choose. Raining this afternoon? We’ll explore the misty cloud forest in the morning and relax in natural hot springs after the showers pass. The dry season too hot? We start early, stay hydrated, and time sunset activities for the cooler evening air.
The “best” time to visit Guanacaste isn’t about the calendar—it’s about what moves you. And we’re here to make sure that whatever season you choose, your trip becomes exactly what you imagined.
Frequently Asked Questions
What is the best month to visit Guanacaste, Costa Rica?
November and May are the sweet spots — they sit at the edges of the dry and green seasons, so you get mostly sunny days with fewer crowds and lower prices. For guaranteed sun choose December through April; for green landscapes and active wildlife, May through November.
Is the green season (May–November) worth it in Guanacaste?
Yes. The green season doesn’t mean all-day rain — the usual pattern is sunny mornings and short afternoon showers, so if you plan activities early you get full days. The payoff is prices 30–50% lower, lush scenery, rivers at their fullest and the most active wildlife.
When is the cheapest time to visit Guanacaste?
September and October, the greenest and wettest months, have the lowest prices of the year. They’re also peak season for turtle arribadas, so the trade-off for more rain is fewer crowds and nature at its most active.
When is the driest, sunniest time in Guanacaste?
Mid-December through April is the dry season: long sunny days, calm seas and reliable conditions. April is the hottest month, up to 35°C (95°F), with the first afternoon showers appearing late in the month.
When is the best time to see wildlife in Guanacaste?
The green season (May–November) is prime for wildlife, when rivers run full and animals are most active. September and October bring the peak turtle arribadas, and the first migratory birds arrive from September onward.
When is the dry season in Guanacaste, Costa Rica?
Guanacaste’s dry season runs from December to April. January through March are the driest and sunniest months, with February the driest of all; April is the hottest and brings the first showers. It’s the most reliable stretch for sun – and also the busiest and priciest.
What is the weather like in Guanacaste, Costa Rica?
Guanacaste is one of the hottest, driest corners of Costa Rica, with daytime highs around 31–33°C all year. December to April is dry and sunny; May to November is the green season, when mornings are usually sunny and short afternoon showers keep the forest lush. It rarely rains all day.
Ready to Plan Your Guanacaste Adventure?
Whether you’re chasing dry season sunshine or green season waterfalls, our private experiences are tailored to your season, your pace, and your interests.
👉 Learn about our Guanacaste experiences · Read our complete Guanacaste travel guide · See our 7-day itinerary.
Staying at the RIU? See our RIU Guanacaste tours and excursions, with door-to-door pickup at the resort.