Last updated: August 27, 2025
In December, Arenal, Peru, experiences a delightful tropical climate characterized by a maximum temperature of 32°C (89°F) and an average of 23°C (74°F). The weather is pleasantly warm, with a minimum temperature dipping to 17°C (64°F) during the cooler nights. Visitors can expect occasional showers, with 3 days of precipitation totaling around 16 mm (0.6 in), while humidity levels remain high at 86%, creating a lush and vibrant atmosphere. This month is ideal for exploring the breathtaking landscapes and diverse wildlife that Arenal has to offer beneath its warm, tropical sun.
In December, Arenal, Peru experiences a delightful transition as the temperatures start to rise, signaling the onset of the warmer season. The minimum temperature hovers around a comfortable 17°C (64°F), while the average settles at a pleasant 23°C (74°F), making it an enjoyable time for outdoor activities. As the month progresses, visitors can expect daytime highs reaching up to 32°C (89°F), perfect for exploring the lush landscapes or relaxing by the iconic Arenal Volcano. Compared to the cooler months prior, December introduces a welcoming warmth, encouraging both locals and tourists to fully embrace the vibrant natural beauty of this stunning destination.
December in Arenal, Peru, marks a transition as the rainy season begins to gently unfold. With 16 mm (0.6 in) of precipitation over 3 days, the month sets the stage for the wetter months ahead. Following a year characterized by low rainfall, especially in the dry mid-year period of June through September, December's increase suggests a notable shift. Compared to the minimal 1 mm of rain typically seen during the height of winter, this uptick is a promising indicator of the lush landscapes that await in the coming months. As nature awakens, the charming beauty of Arenal begins to shine, offering a glimpse into the vibrant, green scenery that will flourish with the arrival of the heavier rains in January and February.
In Arenal, Peru, December marks a notable moment in the region's humidity trends. After the peak levels in January and May at 89%, humidity begins to show a gradual decline, with a noteworthy drop during the mid-year months of July and August, where it dips to 71%. As the year draws to a close, humidity levels begin to rebound slightly, reaching 86% in December. This increase signals a return to the lush, tropical embrace characteristic of Arenal's landscape, providing a rich environment just before the onset of the drier months ahead. Overall, December serves as a transitional month where humidity balances out, maintaining the area's verdant charm while hinting at the seasonal shifts to come.
In December, Arenal, Peru, maintains a UV Index of 13, signifying an extreme risk of harm from unprotected sun exposure, with a rapid burn time of just 10 minutes. This consistency in the December UV Index reflects a broader trend throughout the year, as the region experiences high UV levels, peaking in March at 16. From January through April, the index hovers between 14 to 15, then dips slightly from May to July before stabilizing at 13 from September to December. As such, visitors should be vigilant year-round when outdoors to protect themselves from the intense sun. For more information on the UV Index in Arenal, explore Arenal UV Index.
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December is the crowning month for sunshine in Arenal, Peru, boasting an impressive 345 hours of sun. This surge in sunlight marks a delightful peak in the annual trend, showcasing a steady increase from the year’s early months. After starting at 275 hours in January, the sunshine gradually climbs, reaching its zenith in December. This trend reflects a vibrant sunny disposition, with hours steadily rising through the year, particularly evident from May onwards when Arenal basks in over 330 hours each month. As the year wraps up, residents and visitors alike can revel in the warmth and light, making December an exceptional time to experience the beauty of Arenal.
In Arenal, Peru, the likelihood of sunny weather in December hovers around 29%, marking a slight dip as the year draws to a close. This trend reflects a gradual decrease in sunshine from the preceding months, where conditions become increasingly variable. Notably, the sun shines more consistently in the earlier months of the year, with May boasting the highest chances at 63%. As the rainy season approaches, particularly in the latter half of the year, the chances of enjoying sunny days decline. While December may not offer the sunniest weather, it still presents opportunities for adventure amidst the lush greenery, showcasing the beauty of Arenal in a different light.
In Arenal, Peru, the daylight duration showcases a remarkable consistency throughout the year, primarily fluctuating between 11 to 12 hours. From January to March, residents enjoy a generous 12 hours of daylight, making these months bright and vibrant. As the year progresses into April through August, daylight dips to 11 hours, creating a slightly darker ambiance that invites a cozy atmosphere. However, this shift is brief, as September to November sees the return of the full 12 hours, which culminates in a December that mirrors January's abundant light. This cyclical pattern highlights Arenal's stable equatorial climate, where daylight remains a cherished constant year-round, offering the perfect backdrop for exploration and adventure.
In December, the winds in Arenal, Peru gently whisper at an average speed of 3.6 m/s (8 mph), marking a slight decline from November's breezy wonders. As we look back over the year, a notable trend emerges: wind speeds gradually rise from the serene flows of January and February, peaking in the vibrant months of August, September, and October, where gusts reach around 4.0 m/s (9 mph). This seasonal dance of winds not only enhances the landscape's allure but also sets the stage for thrilling activities and breathtaking scenery, making Arenal a captivating destination as the year draws to a close.
Weather in Arenal varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Arenal, focusing on differences in temperature, rainfall, humidity, and UV levels.
December and January weather show a slight warming trend as the year transitions into the new one. In December, temperatures range from a minimum of 17°C (64°F) to a maximum of 32°C (89°F), with an average of 23°C (74°F) and relatively high humidity at 86%. The month sees about 16 mm (0.6 in) of rainfall over three days. In comparison, January is warmer, with minimum temperatures rising to 19°C (66°F) and maximums reaching 34°C (94°F), while the average temperature increases to 25°C (78°F). Rainfall decreases slightly to 10 mm (0.4 in) over the same number of days, and humidity remains high at 89%. For more details on January weather, you can visit Arenal weather in January.
In December, the weather features a comfortable temperature range, with minimums around 17°C (64°F) and highs reaching up to 32°C (89°F), alongside relatively low precipitation of 16 mm (0.6 in) spread across just three days. The humidity sits at a high 86%, contributing to a warm atmosphere. In contrast, February experiences slightly higher temperatures, with a minimum of 20°C (68°F) and a maximum of 34°C (94°F), combined with increased rainfall of 42 mm (1.7 in) over six days. The humidity remains marginally higher at 87%, which may make the weather feel more humid than in December. For a detailed look at weather conditions, check out Arenal weather in February.
In December, temperatures range from a minimum of 17°C (64°F) to a maximum of 32°C (89°F), with an average of 23°C (74°F). The month experiences low precipitation of 16 mm (0.6 in) over about 3 days, and humidity levels are relatively high at 86%.
In contrast, March shows a significant increase in temperature, with minimums around 21°C (69°F) and maximums reaching 35°C (95°F), averaging 27°C (80°F). Precipitation also rises considerably, totaling 93 mm (3.7 in) across 8 days, while humidity remains similar at 87%.
For a more detailed look at weather conditions during this transitional period, check out Arenal weather in March.
December and April exhibit similar levels of humidity, both at 86%, creating a consistently tropical feel. However, April tends to be slightly warmer, with average temperatures rising from 23°C (74°F) in December to 25°C (78°F), and maximum temperatures peaking at 34°C (94°F) compared to December's 32°C (89°F). Precipitation levels are also comparable, with December receiving 16 mm (0.6 in) over three days, while April sees a marginal increase to 19 mm (0.8 in) over just two days. For a detailed look at the weather patterns during April, you can check Arenal weather in April.
In December, temperatures range from a minimum of 17°C (64°F) to a maximum of 32°C (89°F), averaging around 23°C (74°F). The month sees approximately 16 mm (0.6 in) of rainfall over three days, with a humidity level of 86%. In contrast, May offers a slightly cooler temperature range with a minimum of 16°C (62°F) and a similar maximum of 32°C (91°F), also averaging 23°C (74°F). Rainfall in May is lighter, totaling 6 mm (0.2 in) over just two days, and humidity rises slightly to 89%. For a detailed look at weather patterns during this time, check out Arenal weather in May.
In December, the weather features a comfortable range of temperatures with a minimum of 17°C (64°F), an average of 23°C (74°F), and a maximum of 32°C (89°F). This month also experiences a moderate level of precipitation, totaling 16 mm (0.6 in) over about three days, along with a high humidity level of 86%. In contrast, June brings slightly cooler temperatures, with a minimum of 17°C (63°F), an average of 22°C (71°F), and a maximum of 31°C (87°F). Notably, June is much drier, with only 2 mm (0.1 in) of precipitation and no rainy days, while maintaining a comparable humidity level of 84%. For further details, you can explore Arenal weather in June.
In December, the weather is generally warmer with temperatures ranging from a minimum of 17°C (64°F) to a maximum of 32°C (89°F), and an average temperature of 23°C (74°F). The month experiences moderate precipitation, with about 16 mm (0.6 in) spread over three days, contributing to a high humidity level of 86%. In contrast, July offers cooler conditions, with temperatures ranging from a minimum of 16°C (60°F) to a maximum of 27°C (82°F) and an average of 20°C (69°F). This month is notably dry, boasting only 1 mm (0.1 in) of precipitation over zero days, resulting in a more comfortable humidity level of 71%. For more detailed weather insights, check Arenal weather in July.
December and August display notable differences in weather patterns. December enjoys warmer temperatures, with averages soaring around 23°C (74°F) and highs reaching up to 32°C (89°F), while August is cooler, averaging 20°C (68°F) and peaking at 27°C (82°F). Additionally, December experiences more precipitation, with 16 mm (0.6 in) reported over three days, compared to August, which records minimal rainfall of just 1 mm (0.0 in) over zero rainy days. Humidity levels are also higher in December at 86%, contrasting with August's relatively comfortable 71%. For more insights into the weather during this time, you can check Arenal weather in August.
In December, the weather tends to be warmer, with minimum temperatures averaging 17°C (64°F) and maximum temperatures reaching up to 32°C (89°F). The month also experiences higher humidity at 86%, along with some precipitation, averaging 16 mm over three days. In contrast, September showcases a milder climate with minimum temperatures around 15°C (60°F) and maximum temperatures of 28°C (83°F). It enjoys much lower humidity at 75% and minimal precipitation of just 1 mm, with no rainy days. For more detailed insights into the weather during this month, check out Arenal weather in September.
In December, the temperatures are generally warmer, with a minimum of 17°C (64°F) and a maximum reaching 32°C (89°F), compared to October, which has a minimum of 16°C (61°F) and a maximum of 29°C (85°F). December also experiences higher humidity at 86%, while October's humidity is more comfortable at 77%. Notably, December sees a slight increase in precipitation, averaging 16 mm (0.6 in) over 3 days, whereas October typically records only 4 mm (0.1 in) without any rainfall. For a more detailed look at the weather during October, you can visit Arenal weather in October.
In December, the weather is generally warmer and more humid compared to November. The minimum temperature rises slightly from 15°C (59°F) in November to 17°C (64°F) in December, while the average temperature increases from 21°C (70°F) in November to 23°C (74°F) in December. The maximum temperature also sees a notable rise, reaching 32°C (89°F) in December compared to 30°C (86°F) in November. Additionally, December experiences more precipitation, with 16 mm (0.6 in) falling over 3 days, compared to just 5 mm (0.2 in) over 1 day in November. Humidity also increases, averaging 86% in December compared to 79% in November. For more detailed information, check out Arenal weather in November.
As December unfolds in Arenal, expect a delightful shift in weather that sets it apart from the other months. With warm temperatures peaking at a cozy 32°C, the air is filled with a vibrant humidity of 86% that adds to the lushness of the region. Although December introduces a bit more rainfall with approximately 16 mm over just three days, it provides a refreshing contrast to the otherwise drier preceding months. This blend of warmth and occasional showers creates an enchanting atmosphere, perfect for exploring the breathtaking landscapes. For a deeper understanding of what Arenal has to offer throughout the year, be sure to check out Arenal Climate.