Last updated: August 21, 2025
Atenas, Costa Rica, experiences a delightful January, characterized by warm temperatures and moderate humidity. With maximum highs reaching 31°C (87°F) and average temperatures around 23°C (74°F), the climate is perfect for outdoor activities. Though the minimum temperatures dip to 17°C (63°F) at night, it offers a pleasant contrast. January also sees 28 mm (1.1 in) of rainfall spread over approximately 7 days, making it a month for both sunshine and occasional showers. The humidity hovers around 68%, contributing to the lush, vibrant landscapes that define this charming town.
In Atenas, Costa Rica, January marks the beginning of the dry season with temperatures that offer a delightful blend of warmth and coolness. The average temperature hovers around 23°C (74°F), complemented by minimums of 17°C (63°F) and maximums reaching 31°C (87°F). As the month unfolds, the weather remains consistently pleasant, paving the way for the similar warm conditions that carry into February. This month retains comparable maximums, while the average builds slightly warmer, showcasing a trend of steadily rising temperatures as the year progresses. By analyzing the overall patterns, it's evident that January serves as a gentle introduction to the sunnier months ahead, making it an inviting time for visitors seeking warm days and cooler nights in this picturesque region.
In Atenas, Costa Rica, January marks the start of the year with relatively low precipitation, accumulating just 28 mm (1.1 in) over approximately 7 rainy days. This modest rainfall contrasts sharply with the deluge that precedes the wet season, as the precipitation begins to ramp up significantly in April, escalating to a staggering 639 mm (25.2 in) in October. The dry spell of January and February, where rainfall dwindles to only 13 mm (0.5 in), hints at the transition from the dry season to the wetter months ahead. With every passing month into May and June, rainfall intensifies, culminating in nearly daily showers that define the region's lush, tropical landscape. This gradual increase in precipitation not only nurtures the verdant flora but also prepares the area for the typically heavy rains of the latter half of the year.
In January, Atenas, Costa Rica experiences a comfortable humidity level of 68%, setting the tone for a relatively dry start to the year. This figure remains consistent into February, before gradually decreasing to 66% in March. As the region transitions into the warmer months, humidity levels see a slight uptick in April and May, reaching 67% and 69%, respectively. However, the onset of the rainy season in June brings a significant surge in humidity, peaking at an impressive 84% in that month, followed by 85% in July. This elevated humidity persists through the heart of the rainy season, with levels hovering around 82% in August and 81% in September. As the year winds down, humidity gradually declines, settling at 80% in both October and November, and finally dropping to 72% in December. This annual cycle emphasizes the tropical nature of Atenas, where the balance between dry and humid periods shapes the region's lush landscapes.
In Atenas, Costa Rica, January greets sun-seekers with a UV Index of 12, categorized as extreme, which means a minimal exposure time of just 10 minutes can lead to sunburn. As the month progresses into February, the UV Index slightly rises to 13, maintaining the extreme rating, with burn times unchanged. March and April peak at a notable 15, continuing the trend of high UV exposure and reminding outdoor enthusiasts of the importance of sun protection. Even as we move into May and June, the UV Index remains elevated at 14, preserving this extreme classification. Thankfully, a slight dip occurs in November and December, when the UV Index returns to 12 and 10, respectively, offering a brief respite. Staying vigilant against sun exposure is vital throughout the year in Atenas, a reality that prompts both locals and visitors to take precautions. For further details on this important climate aspect, check out Atenas UV Index.
UV Risk Categories
In Atenas, Costa Rica, the month of January welcomes residents and visitors alike with an impressive 249 hours of sunshine, making it a delightful start to the year. As the months progress into February and March, sunshine hours steadily increase, peaking at 329 hours in March. This radiant trend begins to taper off slightly in April, but with 300 hours still glimmering, the warm days continue to invite outdoor activities. As the rainy season approaches, sunshine hours dip in May and June, hovering around 235 and 226 hours, respectively. However, even during this period, Atenas manages to maintain a pleasant ambiance. The months of July and August see a further decline, but the sun still makes its presence felt. By November and December, sunshine returns to its glory, culminating in 291 hours in December. This variation throughout the year underscores Atenas as a destination where sunshine is abundant, particularly in the early months, creating a vibrant and inviting atmosphere that thrives in natural beauty.
In Atenas, Costa Rica, January boasts a 57% chance of sunny weather, making it one of the sunniest months of the year. Following closely, February and December also enjoy favorable conditions with chances of 55% and 56%, respectively. As we transition into early spring, the likelihood of sunshine begins to wane, plunging to 52% in March and sinking significantly to 24% by April. This trend continues throughout the rainy season, where the chances plummet further with only 7% in August and 10% in September. Therefore, if you're seeking the sun, January is an ideal time to bask in Atenas' vibrant climate before the shift to cloudier days.
In Atenas, Costa Rica, January sets the stage with a consistent 11 hours of daylight, a pattern that continues into February. As spring unfolds in March, daylight extends to 12 hours, ushering in a period of longer days that lasts through most of the year. From March through August, residents and visitors alike enjoy this abundant sunlight, perfect for outdoor activities and exploration. As autumn approaches in September, this daylight duration remains steady before tapering back to 11 hours in October, a trend that echoes through the final months of the year. This rhythmic cycle of daylight highlights Atenas’s tropical climate, where the length of day shifts subtly with the changing seasons, creating a balanced environment for enjoying both vibrant days and cozy evenings.
In Atenas, Costa Rica, January heralds a gentle breeze, with average wind speeds reaching 2.0 m/s (4 mph). This tranquil start to the year sets a comfortable tone that continues through February, maintaining the same mild pace. As March arrives, a slight increase to 2.1 m/s (5 mph) adds a hint of invigorating freshness, while April begins a gradual decline, embracing calmer conditions that persist through the rainy season. The winds reach their lowest ebb during the peak months of June and August, frequently lingering around 1.1 m/s (3 mph). However, as the year draws to a close, winds regain their character, with December bringing a refreshing 1.6 m/s (4 mph). Overall, the trends in Atenas reflect a peaceful, albeit fluctuating wind landscape, providing both tranquility and freshness throughout the year.
Weather in Atenas varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Atenas, focusing on differences in temperature, rainfall, humidity, and UV levels.
In comparison to January, February exhibits slightly warmer average temperatures, with a minimum of 16°C (62°F) and an average of 24°C (76°F), as opposed to January's minimum of 17°C (63°F) and average of 23°C (74°F). Both months share the same maximum temperature of 31°C (88°F), but February experiences significantly less precipitation at 13 mm (0.5 in) over just 3 days, compared to January's 28 mm (1.1 in) over 7 days. Remarkably, the humidity remains consistent at 68% for both months, making them feel fairly similar in terms of moisture. For a more detailed look at February weather patterns, visit Atenas weather in February.
January and March weather in Atenas shows some notable differences. In January, temperatures range from a minimum of 17°C (63°F) to a maximum of 31°C (87°F), with an average of 23°C (74°F). The month receives about 28 mm (1.1 in) of precipitation across 7 days, resulting in a humidity level of 68%. In contrast, March exhibits slightly warmer temperatures with a minimum of 18°C (64°F) and a maximum reaching 32°C (89°F), averaging 25°C (77°F). Precipitation decreases to 18 mm (0.7 in) over 4 days, and humidity is marginally lower at 66%. For more detailed information, you can check Atenas weather in March.
In January, the weather in Atenas is characterized by a comfortable range of temperatures, with a minimum of 17°C (63°F) and an average of 23°C (74°F), reaching a maximum of 31°C (87°F). The month sees relatively low precipitation at 28 mm (1.1 in) spread over 7 days, and the humidity hovers around 68%. In contrast, April experiences slightly warmer temperatures, with a minimum of 18°C (64°F) and an average of 24°C (76°F), while still peaking at 31°C (89°F). However, April is significantly wetter, with precipitation totaling 118 mm (4.6 in) across 24 days, accompanied by a slightly lower humidity of 67%. For more details about the weather in April, check out Atenas weather in April.
In January, the weather in Atenas is warm and relatively dry, with average temperatures ranging from a minimum of 17°C (63°F) to a maximum of 31°C (87°F). The month sees a modest 28 mm (1.1 in) of precipitation, with rain occurring on about 7 days. In contrast, May experiences slightly warmer temperatures, with averages between 19°C (67°F) and 30°C (86°F), but it is marked by significantly higher rainfall, totaling 412 mm (16.2 in) over 30 days. The humidity remains fairly consistent, hovering around 68% in January and 69% in May. For a more detailed look at the specific weather conditions in May, check out Atenas weather in May.
In January, the weather in Atenas is warm with average temperatures ranging from a minimum of 17°C (63°F) to a maximum of 31°C (87°F). The month experiences relatively low precipitation, totaling 28 mm (1.1 in) over approximately 7 days, and has a humidity level of 68%. In contrast, June is slightly warmer with temperatures ranging from a minimum of 19°C (66°F) to a maximum of 30°C (86°F). However, June is significantly wetter, receiving 397 mm (15.6 in) of rain spread over 30 days, alongside higher humidity levels of 84%. For more details, check out Atenas weather in June.
January and July display distinct weather patterns. In January, temperatures range from a minimum of 17°C (63°F) to a maximum of 31°C (87°F), with an average of 23°C (74°F) and relatively low humidity at 68%. The month experiences minimal precipitation, totaling just 28 mm (1.1 in) over about 7 days. In contrast, July's weather is warmer, with temperatures fluctuating between a minimum of 19°C (67°F) and a maximum of 29°C (85°F), averaging 24°C (75°F). However, July is significantly wetter, recording 296 mm (11.7 in) of rain spread across 30 days, along with increased humidity at 85%. For more detailed information on weather conditions in July, you can visit Atenas weather in July.
When comparing the weather in January and August, we can observe some notable differences. January tends to be slightly cooler, with temperatures ranging from a minimum of 17°C (63°F) to a maximum of 31°C (87°F), and an average temperature of 23°C (74°F). In contrast, August offers a warmer minimum temperature of 19°C (66°F) and a slightly lower maximum of 30°C (85°F), while the average temperature remains the same at 23°C (74°F).
However, the most significant contrast lies in the precipitation levels. January experiences relatively mild rainfall of only 28 mm (1.1 in) over about 7 days, whereas August sees a dramatic increase in precipitation with 393 mm (15.5 in) spread over 30 days, contributing to higher humidity levels at 82%. This makes August a much wetter month overall, while January provides a more comfortable and drier climate. For more details on the weather in August, you can check Atenas weather in August.
In January, the weather in Atenas features milder temperatures, with minimums of 17°C (63°F) and maximums reaching 31°C (87°F). The month sees relatively low precipitation at 28 mm (1.1 in) spread over 7 days, along with a humidity level of 68%. In contrast, September is significantly wetter, with a total precipitation of 461 mm (18.2 in) over 29 days, indicating a much higher chance of rain. Despite slightly higher minimum temperatures of 18°C (66°F) and an average of 23°C (74°F), the maximum temperature dips to 29°C (85°F), and humidity rises to 81%. For more details on Atenas weather in September, visit Atenas weather in September.
January and October weather in Atenas showcase notable differences. In January, temperatures range from a minimum of 17°C (63°F) to a maximum of 31°C (87°F), with average highs around 23°C (74°F) and relatively low precipitation of 28 mm (1.1 in) over 7 rainy days, making it a drier month. Conversely, October experiences slightly warmer evenings with minimum temperatures of 18°C (66°F). However, it sees a dramatic increase in rainfall, totaling 639 mm (25.2 in) over 30 days, resulting in higher humidity levels of 80%. This contrast highlights January as a relatively dry and warm month compared to the wet and humid conditions typical of October. For more details, check out Atenas weather in October.
January and November in Atenas present distinct weather patterns. January enjoys slightly warmer temperatures, with average highs reaching 31°C (87°F) compared to November's maximum of 29°C (85°F). However, November experiences significantly higher precipitation, averaging 251 mm (9.9 in) over 28 days, in contrast to January's much drier conditions with only 28 mm (1.1 in) of rain across 7 days. Additionally, humidity levels rise in November to 80%, compared to January's 68%. For a closer look at November's climate specifics, you can explore Atenas weather in November.
When comparing the weather in January to December, it’s evident that both months are fairly similar in terms of temperature, with January experiencing a minimum of 17°C (63°F) and a maximum of 31°C (87°F) compared to December's minimum of 18°C (65°F) and maximum of 30°C (86°F). However, January tends to be drier, with only 28 mm (1.1 in) of precipitation over 7 days, while December sees significantly more rainfall, totaling 72 mm (2.8 in) over 18 days. Additionally, humidity levels are slightly lower in January at 68%, compared to 72% in December. For more specific details, check out Atenas weather in December.
As January unfolds in Atenas, visitors are greeted by a pleasant blend of warm temperatures and moderate humidity, making it distinct from other months. With maximums reaching 31°C, the month offers comfortable days ideal for outdoor activities, unlike the hotter mid-year peak. While the average temperature remains a comfortable 23°C, January also sees slightly more precipitation, contributing to the lush, green landscape. With just a few rainy days, this month provides a harmonious balance between sunny spells and refreshing showers, inviting travelers to explore the vibrant surroundings. For more insights on what to expect throughout the year, check out Atenas Climate.