Last updated: April 14, 2025
The climate of Costa Rica is marked by significant variability, shaped by its diverse geography and climate zones. Temperatures range from a cool 8°C (47°F) in February in Cartago to a sweltering 39°C (102°F) in April in Guanacaste. Precipitation patterns also exhibit notable extremes, with a low of just 5 mm (0.2 in) in February in Guanacaste escalating to a staggering 697 mm (27.4 in) in October in Puntarenas. Humidity further influences the region's climate, ranging from an average minimum of 65% in March in Guanacaste to an astonishing average maximum of 86% in July in Limón. This dynamic interplay of temperature, precipitation, and humidity creates a rich tapestry of climatic conditions that contribute to Costa Rica's lush biodiversity and vibrant ecosystems.
Costa Rica boasts a rich tapestry of climate zones, thanks to its diverse geography and elevation changes. In the northern region, Alajuela and Guanacaste experience a mix of tropical savanna conditions (Aw) and tropical monsoon climates (Am), while the cooler Cartago features temperate (Cfb) and tropical monsoon climates (Am). Moving towards the coast, Limón thrives in an equatorial rainforest climate (Af), offering lush green scenery, contrasting with Puntarenas, which showcases a blend of rainforest (Af), savanna (Aw), and monsoon (Am) climates. Lastly, the capital San José enjoys a delightful mix of both tropical monsoon and rainforest climates (Am, Af), making it a vibrant hub for travelers seeking a taste of nature's finest. Each zone contributes uniquely to the country's biodiversity and alluring landscapes.
| Climate Zone | Description |
|---|---|
| Af | Tropical rainforest climate with no dry season and high temperatures year-round. |
| Am | Tropical monsoon climate with heavy rainfall and high temperatures. |
| Aw | Tropical savanna climate with a dry season occurring in winter. |
| Cfb | Oceanic climate with mild temperatures and moderate rainfall year-round. |
Costa Rica's monthly temperatures reveal a captivating climatic tapestry, ranging dramatically from the cool highlands to the warm lowlands. In January and February, temperatures hug the lower end with minimums dipping to 8°C (47°F) in Cartago, while the heat intensifies in Guanacaste, reaching up to 37°C (99°F). As March progresses, the warmth holds steady, and April sees a peak maximum of 39°C (102°F) in Guanacaste, marking the hottest spell of the year. The temperatures gradually moderate from May onwards, with minimums around 12°C (54°F) in Cartago and maximums remaining comfortably warm in the mid-30s °C. The onset of the rainy season in September and October introduces cooler nights, particularly with minimums around 10°C (51°F) to 12°C (55°F), while maximums drop slightly to the low 30s °C. November and December offer a pleasant transition, blending cooler nights with warm days, echoing the country's rich biodiversity and inviting climate year-round.
Costa Rica exhibits distinct precipitation patterns that reflect its diverse climate zones. In February, the dry season peaks, especially in Guanacaste, with minimal rainfall averaging just 5 mm and sometimes experiencing complete dry spells. In contrast, October brings the year's highest rainfall, particularly in Puntarenas, where precipitation can reach a staggering 697 mm over the month. This variation is further highlighted by the number of rainy days—February sees virtually none in Guanacaste, while July can experience up to 30 rainy days in Puntarenas. Such fluctuations underscore the transitional nature of Costa Rica’s climate, showcasing both dry and wet extremes that shape the country’s lush ecosystems.
Costa Rica's humidity levels exhibit notable variation throughout the year and across different regions. In March, the dry and sun-soaked province of Guanacaste experiences a minimum humidity of 65%, providing a comfortable climate for outdoor activities. Conversely, as the year progresses into July, the lush coastal region of Limón sees humidity levels peak at a steamy 86%. This trend highlights the contrast between the drier, warmer months and the more humid, tropical conditions that characterize the rainy season, offering a unique climate experience for both residents and visitors.
In April, Costa Rica experiences notably high UV Index levels, with Guanacaste averaging a daily maximum of 15, while Cartago reaches an even higher average of 16. This trend underscores the intense solar radiation during this month, emphasizing the importance of sun protection for residents and visitors alike. As the country gears up for the dry season, understanding these elevated UV levels can help individuals plan outdoor activities more safely and enjoy the breathtaking beauty of this tropical paradise without compromising skin health.
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Costa Rica enjoys a delightful array of sunshine hours that vary by region and season. In October, the capital city of San José experiences 218 hours of sunshine, while the sun-kissed province of Guanacaste basks in a more generous 245 hours. This trend shifts dramatically in March, when both Alajuela and Guanacaste see a surge in sunlight, with Alajuela receiving an impressive 327 hours and Guanacaste leading the way with 334 hours. Such variations highlight Costa Rica's diverse climates, offering both sunny escapes and vibrant experiences throughout the year.
When planning a trip to Costa Rica, understanding the likelihood of sunny weather can greatly enhance your experience. Trends in sunshine reveal a stark contrast between regions and months. For instance, Puntarenas experiences a mere 6% likelihood of sunny days in August, making it one of the cloudier times of the year in this area. In contrast, travel to Guanacaste in February boasts an impressive 62% chance of basking in the sun, providing ideal conditions for beach lovers and outdoor enthusiasts. This variation underscores the importance of timing and location in enjoying Costa Rica’s beautiful weather.
In Costa Rica's Guanacaste region, daylight hours reveal an intriguing seasonal rhythm. During December, the days are shorter, offering around 11 hours of sunlight, which invites a cozy atmosphere perfect for holiday gatherings and intimate outdoor adventures. As the year progresses into June, daylight extends to approximately 12 hours, providing a blissful backdrop for vibrant summer activities and explorations under the bright sun. This gradual increase in daylight reflects the welcoming shifts of the tropical climate, enhancing the allure of visiting this beautiful part of Central America.
Nestled in the heart of Costa Rica, Alajuela showcases a captivating climate that's as vibrant as its culture. With temperatures ranging from a cool 12°C (54°F) in January to a warm 35°C (96°F) in May, residents and visitors enjoy a pleasant tropical experience year-round. However, be prepared for the rainy season that sweeps in around April, bringing significant rainfall, especially in October, where 518 mm (20.4 in) can fall. Humidity can peak during the summer months, providing a lush backdrop to the region's stunning landscapes. Discover more about the changing seasons and rainfall patterns by exploring Alajuela climate.
Nestled in the heart of Costa Rica, Cartago boasts a temperate climate characterized by mild temperatures year-round. With January and February showcasing cool mornings averaging 17°C (62°F) and maxing out around 25°C (78°F), the weather is perfect for exploring. However, as the rainy season sets in from May to October, expect heavier precipitation, peaking in October with about 495 mm (19.5 in) of rain. Humidity levels rise, particularly in June and July, creating a lush, vibrant atmosphere that invigorates the region. Explore more about this charming destination by visiting Cartago climate.
Guanacaste, Costa Rica, boasts a tropical climate that offers warm temperatures year-round, with January temperatures ranging from a cool 14°C (58°F) to a sizzling 36°C (97°F) by day. The dry season from January to April sees significantly lower rainfall, with February receiving a mere 5 mm (0.2 in), setting the stage for vibrant outdoor adventures. As the rainy season sweeps in from May to October, humidity levels rise and storms become more frequent, culminating in October's rainfall of 426 mm (16.8 in). Despite the showers, lush landscapes and cooler evenings make September and October magical times to explore. For more detailed insights, check out the full Guanacaste climate.
Heredia, Costa Rica, boasts a delightful tropical climate that varies throughout the year. Temperatures typically range from a refreshing 11°C (53°F) in January to a warm 34°C (93°F) in May, with consistent averages hovering around 20°C (68°F). While the dry months of January and February see minimal rainfall, the wet season from May to October brings substantial precipitation, peaking in October with over 500 mm (20.3 in). The humidity also climbs during these months, often reaching up to 85%, creating a lush, vibrant atmosphere ideal for exploring the region's natural beauty. For a detailed monthly breakdown, visit Heredia climate.
Nestled on the vibrant Caribbean coast, Limón, Costa Rica, boasts a tropical climate that brings warmth and lush greenery year-round. Temperatures gently fluctuate between a cool 14°C (58°F) and a sizzling 34°C (94°F), offering a comfortable average around 25°C (77°F). While the dry season from January to March sees lower precipitation levels, the lush wet season from May to October leads to intense rainfalls, transforming the landscape into a verdant paradise. Humidity tends to rise during the wetter months, peaking around 86% in July, making those balmy evenings perfect for indulging in the rich local culture. Discover more about this lively coastal city’s weather patterns at Limón climate.
Experience the captivating climate of Puntarenas, Costa Rica, where warm temperatures and refreshing breezes beckon year-round. With average temperatures lingering between 24°C (76°F) and 34°C (93°F), the region offers a delightful range of warmth. However, prepare for the rainy season from May to October, when heavy showers can bring over 600 mm of rain in just one month, peaking in October. The humidity rises significantly during the wet months, creating a lush paradise ideal for tropical exploration. For more detailed information on weather patterns, visit Puntarenas climate.
San José, Costa Rica, enjoys a mild and temperate climate, characterized by year-round pleasant temperatures ranging from an average of 19°C (66°F) to 31°C (88°F). The dry season stretches from December to April, where low humidity and minimal rainfall create ideal conditions for outdoor activities. Conversely, from May to October, the region experiences the green season, marked by increased humidity and significant rainfall, with October being particularly wet, featuring over 600 mm (24.1 in) of precipitation. This dynamic weather fosters lush landscapes and vibrant wildlife, making San José a unique blend of nature and urban life. For a deeper dive into the climate patterns of this captivating city, visit San José climate.
The climate of Costa Rica is characterized by a remarkable range of temperatures and precipitation patterns, highlighting the country's diverse ecosystems. In the cooler months, temperatures can dip to a refreshing 8°C (47°F) in February in Cartago, while the heat peaks at a sweltering 39°C (102°F) in April in Guanacaste. Precipitation varies significantly throughout the year; with a minimum of 5 mm (0.2 in) in February in Guanacaste to a staggering 697 mm (27.4 in) in October in Puntarenas. Humidity levels also reflect this variability, averaging a comfortable 65% in March in Guanacaste, but rising to a remarkably humid 86% in July in Limón. These climatic trends create a unique environment that supports Costa Rica's rich biodiversity and makes it an attractive destination for travelers seeking both adventure and relaxation amidst nature.