Explore Costa Rica's Weather and Skies Month by Month

Costa Rica's weather is not one climate but several, layered across a country small enough to cross in a day. Guanacaste can sit in the mid-90s under a cloudless sky while Monteverde, two hours away, sits wrapped in cool mist at 65 degrees. Understanding how those regional differences shift month to month matters as much as knowing whether a given week falls in the dry season or the green season.

Costa Rica's National Meteorological Institute tracks these regional patterns closely, since rainfall and temperature vary enough between the Pacific, Caribbean, and highland regions that a single national forecast rarely tells the full story. Planning around that regional detail, rather than a single dry season or green season label, is what actually determines whether a trip feels sun soaked or soggy.

What Costa Rican Weather Actually Feels Like

Humidity, not temperature alone, defines how Costa Rica's weather actually feels on the ground. The Central Valley, home to San Jose, stays mild and spring-like nearly year round, rarely climbing out of the 70s. The Caribbean coast runs warm and humid in almost every month, with rain a near-constant possibility even during months technically outside the wet season. Guanacaste, by contrast, turns dry and dusty by the height of dry season, closer to desert conditions than rainforest.

Cloud forest regions like Monteverde add a fourth variable entirely, staying cool and misty regardless of season, since elevation does more to shape that climate than the calendar does. Our Monteverde birdwatching guide covers what that consistent mist means for wildlife viewing throughout the year.

January and February Under Clearer Skies

These two months typically bring Costa Rica's clearest, driest weather nationwide, with the Pacific side especially reliable for sunshine. Nights cool noticeably in higher elevations, and travelers heading to Monteverde or the Central Valley's mountain towns should pack a layer for evenings that can dip into the 50s.

The Caribbean coast, while generally drier than its wettest months, can still see scattered rain even during this stretch, since its weather pattern runs on a different rhythm than the rest of the country.

March and April at the End of the Dry Season

March and April mark the driest, hottest point of the year across most of the country, particularly in Guanacaste, where rivers and forest floors visibly dry out by the end of April. Skies stay clear for extended stretches, which makes this window popular for open-country photography and long hiking days without rain gear.

That same dryness affects the landscape's appearance. Forests that look lush and green in October can look noticeably browner and more stripped back by late April, especially in the country's drier northwest. Our guide to Pacific coast beaches covers the stretch of coastline that benefits most from this stretch of reliably dry, sunny weather.

May and June as the Rains Return

May typically brings the first sustained rain of the green season, arriving as predictable afternoon and evening showers rather than constant downpours. Mornings usually stay clear enough for hiking or wildlife viewing before clouds build through the afternoon.

By June, the transformation is obvious. Forest color deepens, rivers rise, and waterfalls that looked thin in April return to full flow. Our guide to an Arenal volcano hiking adventure covers a region where this shift is especially visible, since the volcano's slopes green up quickly once the rains settle in. Arenal Volcano National Park's official page lists current trail and access conditions, worth checking before a visit during this transitional window.

July and August During the Midyear Break

Costa Rica's green season includes a short dry spell locally known as the veranillo, which frequently falls across July and part of August, particularly along the Pacific coast. Rainfall eases relative to the surrounding months, giving these weeks a reputation as a reasonable middle ground between peak dry season crowds and the heaviest green season rain.

Humidity remains high throughout, even during drier stretches, so lightweight, quick-dry clothing still matters more than heavy rain gear during this window.

September and October Across Two Coasts

These two months bring the heaviest rainfall of the year to the Pacific coast and Central Valley, with some backroads becoming difficult to pass after sustained downpours. The Caribbean coast runs on an almost opposite schedule, entering its own secondary dry season and often delivering some of its clearest weather of the entire year.

• Pacific coast and Central Valley see their wettest weeks of the year during this stretch
• Caribbean coast experiences a secondary dry season, often producing its sunniest conditions all year
• Cloud forest regions stay cool and misty regardless, though trails can turn slick after heavy rain

November and December in Transition

November carries the last of the heavy green season rain before conditions begin drying out. By mid-December, the shift to dry season is usually well underway, with clearer skies returning across most of the country just in time for the holiday travel season.

This transition period can be unpredictable, with some years drying out earlier and others holding onto rain later into the month. Travelers planning an early December trip should build in some flexibility for weather that has not fully settled into the dry season pattern yet.

Photographing Costa Rica Through Every Kind of Weather

Dry season photography favors wide, clear landscape shots, strong contrast, and long golden hour light with little cloud interference. Green season photography rewards a different approach entirely, since dramatic sky and storm light often produce more striking images than a cloudless afternoon ever could.

Cloud forest photography benefits from overcast conditions almost regardless of season, since flat, diffused light in Monteverde's mist tends to look more forgiving than harsh midday sun ever does in the lowlands. Packing the right gear for these shifting conditions matters as much as timing the trip well. Our packing guide covers what to bring for Costa Rica's climate across every region and season.

Find the Month That Brings a Costa Rica Journey to Life

Costa Rica's weather rewards travelers who plan around region as much as season. A month that delivers perfect beach weather on the Pacific side can bring steady rain to the Caribbean coast in that same week, and a cloud forest visit barely changes character no matter when it happens.

Gondwana Ecotours builds departure dates for the Costa Rica: Secluded Wildlife Adventure around these regional patterns, moving small groups between the Osa Peninsula and Caribbean lowlands at the times of year each region shows best. Our broader look at ecotourism in Costa Rica covers how that seasonal planning connects to conservation funding across the country.

For more details about what is included in our itineraries, please visit our tour pages before booking.

Weather in Costa Rica shifts by region as much as by month, and no single forecast covers the whole country. Download our travel details for the most accurate picture of what the Costa Rica: Secluded Wildlife Adventure itinerary actually includes.