May is the month Guanacaste comes back to life. Mornings stay sunny, afternoon showers green the hillsides almost overnight, the sea reaches its warmest of the year, and rates drop to low season. The trade is an hour or two of rain most afternoons.
What You Should Know
- May starts the green season, but not the way most people picture it. Mornings stay sunny and the rain arrives as short afternoon showers, typically around 2pm and lasting an hour or two. Roughly one day in four sees meaningful rain.
- The sea reaches its warmest point of the entire year in May, peaking around the 12th at 28 to 30°C (82 to 86°F). Combined with the Papagayo winds being long finished, this is the most comfortable water of the calendar.
- The transformation is the draw. Four months of bare, brown dry forest greens up almost overnight once the rains start, rivers and waterfalls pick up, and wildlife becomes far easier to find than at any point since December.
- Rates fall to low season and crowds thin sharply, so May delivers dry-season mornings at green-season prices. The cost is losing your afternoons to rain more often than not, which matters most for full-day tours.
Tamarindo in May: Overview
⭐ Best May window: the first two weeks. Early May carries less rain than late May while still getting the green-up benefit, and sea temperature peaks around the 12th. You get the tail of the dry season and the start of the transformation in the same trip.
| Factor | May Rating |
|---|---|
| Weather | 7/10: excellent mornings, unreliable afternoons |
| Crowds | 8/10: the quietest month since last November |
| Prices | 8/10: low season rates return |
| Beaches | 8/10: warmest water of the year, morning sun |
| Surf | 9/10: green season swells start building |
| Snorkeling | 7/10: warm and calm, though runoff can cloud the water |
| Wildlife | 7/10: the green-up transforms it from the dry-season low |
| Waterfalls | 8/10: rivers pick up after four dry months |
| Families | 8/10: warm sea and low rates, if you plan around afternoons |
| Couples | 9/10: quiet town, good value, green landscape |
💰 Average May hotel prices (Tamarindo town, mid-range):
Most of the month: ~$120–170/night
Rough mid-range estimates; rates vary widely by property, location and booking lead time.
May is the month the Guanacaste calendar flips, and the flip is more dramatic here than almost anywhere else in Costa Rica. The tropical dry forest that has been leafless and brown since January greens up within days of the first serious rain. Rivers that were reduced to trickles start running. Wildlife that was nowhere to be found in March reappears. If you have only seen Guanacaste in the dry season, the same landscape in late May is barely recognisable.
What makes May unusually good value is that this happens before the rain becomes a real constraint. Mornings stay sunny and reliable, showers hold off until around 2pm most days, and roughly three days in four see no meaningful rain at all. That is a very different proposition from September or October, and it is why we would separate May from the green season months that follow it rather than lumping them together.
Our take: the biggest difference between May and April is not the rain, it is what the rain does. Most people don't realize the sea also peaks in May, reaching its warmest of the entire year around the 12th, which means the best water of the calendar sits inside the cheapest half of it.
Tamarindo Weather in May
| Metric | May |
|---|---|
| Avg High | 32°C (90°F) |
| Avg Low | 24°C (75°F) |
| Water Temp | 28–30°C (82–86°F), the year's warmest |
| Rain Days | Roughly 1 day in 4 |
| Humidity | High, rising through the month |
| Wind | Light, Papagayo season long over |
| Rain Pattern | Short afternoon showers, usually from around 2pm |
Temperature and Humidity
May runs cooler than April, with highs around 32°C (90°F) against April's 34°C. The rain is what does it: each shower drops the temperature noticeably and the cloud cover breaks up the relentless midday sun that defines March and April. Overnight lows ease back to about 24°C (75°F).
Humidity is the counterweight and it climbs steadily through the month. The practical effect is that May feels less punishing than April in absolute terms but stickier, particularly in the hour before a shower breaks.
Rain Pattern
This is the part worth understanding properly, because green season in Guanacaste is not what the phrase suggests. Rain in May arrives as short afternoon showers, typically starting around 2pm and lasting an hour or two, and roughly one day in four sees meaningful rain at all. Mornings are reliably sunny.
What that means for planning: book anything weather-dependent for the morning and treat the afternoon as flexible. A half-day tour starting at 8am is barely affected by May rain. A full-day tour running to 5pm is a different calculation. This is where tours differ more than in any dry-season month, and it is worth choosing on schedule rather than just on content.
Sea Conditions
The best of the year. Sea temperature climbs to its annual peak around May 12, reaching 28 to 30°C (82 to 86°F), and the Papagayo winds that made January and February difficult have been gone for two months. Water is warm, calm and comfortable for extended time in.
The one qualifier is clarity. As the rains build, runoff from rivers and streams starts putting sediment into the water near shore, which can cloud visibility after a heavy shower. Offshore sites like the Catalinas are less affected than beach entries. Looking at how the season runs, May still delivers better snorkeling than anything from December through March, and the clearest water of the year arrives later in green season, around August.
Crowds and Prices in Tamarindo in May
May is the first genuinely quiet month since November, and the pricing reflects it immediately.
The crowd drops away
Spring break ended in March, Semana Santa ended in early April, and the North American and European summer holidays have not started. What is left is a small, self-selecting crowd: surfers here for the building swell, longer-stay travellers, and people who worked out that green season in Guanacaste mostly means sunny mornings. The town is noticeably quiet, restaurants take walk-ins every night, and tours have same-day or next-day availability.
Rates reset to low season
Mid-range rooms fall to roughly $120 to $170 a night, down from $190 to $260 in March and a long way below the Semana Santa peak. Tour prices themselves do not change much, since operators run fixed rates year-round, but accommodation, car hire and flights all soften.
How it compares to late April
Late April is the closest competitor: it also carries low crowds and falling rates, with no rain at all. May undercuts it slightly on price and adds warmer water, a green landscape and better wildlife, at the cost of losing some afternoons. We think the tradeoff favours May for anyone who cares about scenery or wildlife, and favours late April for anyone whose itinerary is packed with full-day activities.
We'd book this if value matters and you can structure days around morning activity. We wouldn't choose it for a very short trip where a single washed-out afternoon eats a meaningful share of the holiday.
The Green-Up: What Actually Changes in May
Guanacaste is tropical dry forest, and that ecosystem behaves differently from the rainforest most visitors picture when they think of Costa Rica. It drops its leaves and shuts down through the dry months, then restarts. May is the restart.
The landscape
Hillsides that were brown and bare through March and April green up within days of the first serious rains. It is one of the fastest visible landscape changes in the country, and by late May the same drive that looked parched in April looks tropical. Four months of accumulated dust on the roads and vegetation clears at the same time.
Wildlife
This is the practical payoff. Through the dry season the leafless forest and scarce water made wildlife hard to find, and we rated it 3 to 5 out of 10 across January to April for exactly that reason. As the forest recovers, animals disperse from the few remaining water sources and become both more numerous and more active. It does not reach peak green-season levels in May, but the direction of travel is unmistakable.
From what we've seen in reviews, the inland wildlife trips that were a workaround in the dry season become genuinely strong bookings from May onward, because the forest they visit is no longer the only green thing in the region.
Rivers and waterfalls
Rivers pick up through the month after four months of decline. Waterfalls that were thin in April start running properly again, and the river-based sections of adventure tours get more substantial. The flip side is that heavy rain upstream can cloud water that was clear, which affects Rio Celeste in particular: its blue colour depends on low sediment, so the dry months are when it looks its best. Our Rio Celeste tour guide covers how upstream rain changes what you see.
Surf
Green season is swell season on this coast. The offshore winds that shaped the dry-season waves are gone, but the swells themselves get bigger and more consistent from May onward, and the remote northern breaks reached by boat come into their own. We'd shortlist May for surfers who have outgrown beginner conditions and want size rather than shape.
Best Things to Do in Tamarindo in May
May's activity rankings shift toward the things the rain improves rather than the things it threatens. Wildlife, waterfalls and surf all get better this month; only the timing of your day needs more thought than it did in April.
| Activity | May Rating | Best Time of Day | Notes |
|---|---|---|---|
| Sloth and inland wildlife trips | 9/10 | Morning | The green-up transforms these from a dry-season workaround into the month's strongest booking. |
| Surf lessons | 9/10 | Morning | Swells build through green season, and the water is at its warmest of the year. |
| Snorkeling and catamaran days | 7/10 | Morning | Warmest calmest water of the year, though runoff can cloud visibility after heavy rain. |
| Zipline and volcano combos | 8/10 | Early morning | Greener and cooler than April, with fuller rivers for the tubing section. |
| Estuary boat safari | 8/10 | Early morning | Wildlife more active as the forest recovers, though less concentrated than in dry season. |
| Beach days | 8/10 | Morning | Warmest sea of the calendar. Plan for an afternoon interruption. |
| Sunset catamaran | 7/10 | Late afternoon | Still good, but the late slot is now the one most exposed to a shower. |
| Rio Celeste day trip | 7/10 | Early start | Fuller rivers, but upstream rain can turn the blue water brown. Check before committing. |
| ATV tours | 8/10 | Morning | Much improved: the dust of March and April is gone and the landscape is green. |
| Turtle nesting tour | 2/10 | After dark | Season is over. Nesting resumes around October. |
Why the sloth and forest day is our May pick
We would give this the edge for May because it is the tour whose value changes most with the season. Through January to April we kept recommending inland trips as a way to escape a bare, brown coastal forest. In May that framing stops applying: the forest itself is coming back, the animals are dispersing and active, and a wildlife-led day stops being a workaround and becomes the point.
It also fits May's rhythm. The schedule runs in the morning and early afternoon, which puts you back before the showers that typically arrive around 2pm. The honest tradeoff is the drive: this is an inland day from the coast, so expect a long one, and a private format at $145 sits at the higher end of the tours on this page. Our Tamarindo sloth tour guide compares the wildlife options and where sightings are most reliable.
The rest of the shortlist
Surf lessons are arguably better value in May than in any other month: the water is at its warmest, the swell is building, and the town is quiet enough that lessons run small. ATV tours jump from their April low now the dust has settled and the landscape is green. And if you want water, the all-inclusive Flamingo catamaran day still works well, though we would take a morning departure rather than the sunset slot this month.
Other Things to Do in Tamarindo in May
Worth adding to a May itinerary, and without a dedicated guide of their own:
- Witch's Rock and Ollie's Point by boat. The famous northern breaks in Santa Rosa National Park pick up bigger, more consistent swell once the rains set in, and boat trips from Tamarindo are how you reach them. This is an experienced-surfer trip, not a beginner one.
- Waterfalls that were thin in April. Llanos de Cortes and the smaller Guanacaste falls run properly again from May, after four months of decline.
- An afternoon rain on a covered terrace. Worth planning for rather than fighting. The showers are short, the temperature drop is welcome, and the light afterwards is the best of the day.
- Rincon de la Vieja National Park, early. Still very doable in May, but go on a morning slot: trails get slick and afternoon storms are more likely at elevation.
- Playa Conchal and Las Catalinas. The warmest water of the year makes May a strong month for both, best in the morning before runoff and cloud arrive.
- Birdwatching anywhere green. The return of leaves and water brings bird activity back sharply after the dry-season lull, and you do not need a tour to notice the difference.
Our Take
The thing to understand about May is that green season here does not mean losing days, it means losing afternoons. Roughly three days in four see no meaningful rain at all, and the ones that do usually clear within a couple of hours, so the fix is scheduling rather than avoidance.
Tips for Visiting Tamarindo in May
- Book everything weather-dependent for the morning: Showers typically arrive around 2pm and last an hour or two. An 8am start is barely affected; a tour running to 5pm is a different bet entirely.
- Favour half-day tours over full-day ones: This is the structural change from the dry season. Full-day trips spend their back half in the window most likely to be wet.
- Get in the sea this month: Water peaks at its warmest of the year around May 12, at 28 to 30°C. It is the most comfortable swimming of the calendar and it coincides with low-season rates.
- Snorkel in the morning, and offshore if you can: Runoff after heavy rain clouds near-shore water. Offshore sites like the Catalinas hold clarity better than beach entries.
- Check upstream weather before a Rio Celeste day: The river's blue depends on low sediment, so rain over Tenorio can brown it while Tamarindo is sunny. That is a different forecast from the one outside your hotel.
- Pack a light rain layer, not wet-weather gear: May showers are warm and short. A packable shell is enough, and a full rain jacket is more than the month requires.
- Expect slicker ground on trails: Volcano trails and forest paths that were firm through April start holding moisture. Shoes with grip matter more than they did last month.
- Do not book a turtle tour: Nesting season near Tamarindo runs October to April. May is outside it, and it resumes around October.
- Visiting at a different time of year? Our Tamarindo in June guide covers the next month, when green season settles, the rain roughly doubles and the first three weeks are the cheapest of the year. Our Tamarindo in April guide covers the last fully dry month.
How We Built This May Guide
May is a transition month and we built this guide around what actually transitions. The headline is rain, but the rain is the least interesting part: it arrives in short afternoon bursts on roughly one day in four, which changes the shape of a day rather than whether you can do anything. What changes materially is everything the rain triggers, namely the dry forest greening up, wildlife returning, rivers refilling, and swells building on the coast. That drove the ratings. Wildlife, waterfalls, surf and ATV tours all rise from their dry-season positions this month, and we have said explicitly where a tour we rated lower in January to April improves, rather than quietly re-scoring it. Only the timing advice tightens: morning bookings and half-day formats hold up far better in May than full-day schedules running into the afternoon. We also separated May from the rest of the green season rather than treating them together. September and October are a genuinely different proposition, and applying green-season caveats uniformly across seven months would misrepresent this one. Tour selection came from the eight most-reviewed tours across our existing Tamarindo guides, ranked by review volume rather than preference. The May standout was chosen on seasonal fit, which is why a wildlife-led inland day leads a month where the forest is the thing that changed. On sourcing: temperature, rainfall, wind and sea-temperature figures come from published climate and surf datasets, given as ranges where sources disagree. Rain frequency and timing are described as typical patterns rather than guarantees, because the onset of the rains varies year to year. Prices and review counts come from operators and platform listings as of September 2026. Hotel figures are rough mid-range estimates rather than quoted rates. Nobody on our team was in Tamarindo this May, and we have not written as though we were.
Frequently Asked Questions
Is Tamarindo good in May?+
Yes, and it is one of the better value months of the year. Mornings stay sunny, rain arrives as short afternoon showers on roughly one day in four, the sea reaches its warmest of the entire year, and rates fall to low season. The tradeoff is that afternoons become unreliable, which matters most for full-day tours.
What is the weather like in Tamarindo in May?+
Warm and humid with sunny mornings. Highs average around 32°C (90°F), cooler than April because the rain and cloud break the heat, with lows near 24°C (75°F). Showers typically start around 2pm and last an hour or two, and roughly three days in four see no meaningful rain at all.
Does it rain a lot in Tamarindo in May?+
Less than the phrase green season suggests. May is the first month of the rainy season and the rain arrives as short afternoon bursts rather than all-day weather. Roughly one day in four sees meaningful rain, and mornings stay reliably sunny, which is very different from September and October.
Is the water warm in Tamarindo in May?+
It is the warmest of the entire year. Sea temperature peaks around May 12 at 28 to 30°C (82 to 86°F), and the Papagayo winds that made the water cold and choppy from December to March have been gone for two months. The one caveat is that runoff after heavy rain can cloud near-shore visibility.
Is May cheap in Tamarindo?+
Yes. Rates reset to low season, with mid-range rooms around $120 to $170 a night, compared with $190 to $260 in March. Tour prices themselves stay fairly constant year-round, but accommodation, car hire and flights all soften once the dry season ends.
What is the best week to visit Tamarindo in May?+
The first two weeks. Early May carries less rain than late May while still benefiting from the green-up, and sea temperature peaks around the 12th. You effectively get the tail end of the dry season alongside the start of the transformation, at low-season rates.
What activities are best in Tamarindo in May?+
Wildlife and inland trips improve sharply as the forest greens up, and that makes the sloth and forest day the month's standout. Surf lessons are excellent with the warmest water of the year and building swell, and ATV tours recover strongly now the dry-season dust has settled. Book everything for the morning.
Is May or April better in Tamarindo?+
April if you need guaranteed dry afternoons and a packed full-day itinerary. May if you want warmer water, a green landscape, better wildlife and lower rates, and can structure your days around mornings. Late April is the closest competitor, since it also has low crowds and falling prices with no rain at all.
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