Last updated: August 21, 2025
Experience the vibrant December weather in Buenos Aires, Argentina, where temperatures typically reach a maximum of 34°C (94°F), with a pleasant average of 23°C (73°F). As the warm summer sun embraces the city, temperatures can dip to a refreshing 10°C (50°F) at night. Visitors can expect about 66 mm (2.6 in) of rain over 7 days, delivering occasional, refreshing downpours amidst the otherwise sunny spells. With a humidity level of 56%, the air carries a hint of tropical warmth, making December an ideal time to enjoy the dynamic culture and festive atmosphere of this remarkable city.
In December, Buenos Aires basks in the warmth of summer, with temperatures ranging from a minimum of 10°C (50°F) to a maximum of 34°C (94°F). The average temperature settles at a pleasant 23°C (73°F), making it an ideal time for outdoor activities and exploring the vibrant streets of the city. As the month unfolds, the heat intensifies, hinting at the typical Argentine summer heatwave that follows in January and February. This transition from the cooler months to the sweltering peak showcases the city's climate versatility, providing visitors with a perfect window to experience the festive energy of Buenos Aires in full swing.
In December, Buenos Aires experiences a moderate precipitation of 66 mm (2.6 in), marking a slight decrease compared to the heavier rainfall recorded in the preceding months. With rain falling on an average of 7 days, residents can expect occasional showers amidst the warmth of early summer. This month sits comfortably in the middle of the city's annual precipitation pattern, which peaks in October with a notable 103 mm (4.1 in). As the year wraps up, the precipitation trend suggests a transition to drier conditions, paving the way for the drier summer months ahead. While December's rainfall is less intense than in the previous months, it contributes to the lush landscapes that characterize the city during this vibrant time of year.
As December unfolds in Buenos Aires, Argentina, the city's humidity reaches 56%, marking a notable decline from the wetter months that precede it. This month signals a transitional period; after the highs experienced from April to May, where humidity peaked at 85%, levels begin their annual tapering. Following the summer’s pinnacle in February at 61%, humidity steadily dips, allowing for more comfortable conditions as the year draws to a close. This gentle decrease reflects a balance in the regional climate, providing an inviting atmosphere for both locals and visitors eager to enjoy the vibrant city.
In December, Buenos Aires experiences its peak UV Index at 14, maintaining an extreme exposure category, which means you could risk sunburn in as little as 10 minutes. This marks a continuation of a trend observed from November, where the UV Index also reached 13, indicating that the summer months are particularly fierce. Following a gradual decrease in the UV Index from March (11) through June (4), the levels escalate again towards the end of the year, urging residents and visitors alike to be vigilant about sun protection. With sunburn potential spiking in the early summer, it’s essential to stay informed and take precautions during these intense UV conditions. For those seeking more information, check out the Buenos Aires UV Index.
UV Risk Categories
In December, Buenos Aires basks in the glow of 383 hours of sunshine, making it the sunniest month of the year. This radiant time marks a delightful transition from the cooler months, with sunshine hours gradually increasing from the depths of winter in June and July, where the city sees just over 200 hours. As summer approaches, the sun begins to emerge more vividly; November already shines with 341 hours, paving the way for December's peak. The trend highlights a consistent rise in sunlit days as the year draws to a close, inviting locals and tourists alike to enjoy outdoor festivities and explore the vibrant streets of this beautiful city.
In Buenos Aires, December brings a promising 68% chance of sunny weather, aligning with the city's overall trend towards brighter skies as summer approaches. Following a notably sunny October at 69%, the likelihood of sun in December remains strong, hinting at the sunny days of summer just around the corner. This favorable weather pattern peaks in the warmer months, making December a delightful time to explore the vibrant streets of the city, enjoy outdoor gatherings, or soak up the sun in one of its beautiful parks. As the year winds down, Buenos Aires showcases its charm under a warm sun, enticing both locals and visitors alike to embrace the festive atmosphere.
In Buenos Aires, December marks a vibrant peak in daylight, offering an impressive 14 hours of sunlight each day. This broad span of daylight continues the trend established in January, where residents bask in the same generous amount of light. As the year transitions into February and March, daylight hours gradually taper to 13 and 12 hours respectively, signaling the onset of the seasonal shift. By April, days shorten further to 11 hours, continuing through the mid-year months. The fleeting daylight reaches its lowest in June at just 9 hours, before beginning its slow yet steady rise again. From July to August, daylight plateaus at 10 hours, then begins to climb once more, culminating in the longer, sun-filled days of spring. This rhythmic cycle of daylight in Buenos Aires beautifully reflects the balance of the changing seasons, inviting both locals and visitors to revel in the natural beauty of summer.
As December arrives in Buenos Aires, the city's winds begin to pick up, averaging 4.9 m/s (11 mph), a notable increase compared to the calmer autumn months. This wind speed reflects a gentle boost from the summer season, reminiscent of November's 5.3 m/s (12 mph), which wraps up spring with invigorating breezes. Interestingly, December's winds are slightly stronger than those of earlier months, indicating a transition as the city braces for the warm summer ahead. The trend throughout the year shows a gradual escalation in wind speeds during the spring and early summer, peaking in September and November before settling into December's comfortable breezes, enhancing the vibrant atmosphere of the festive season. With these winds gently caressing the city, Buenos Aires becomes an inviting space to enjoy the warm sun and the spirit of summer.
Weather in Buenos Aires varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Buenos Aires, focusing on differences in temperature, rainfall, humidity, and UV levels.
December and January both feature warm weather, but January tends to be slightly hotter and more humid. In December, temperatures range from a minimum of 10°C (50°F) to a maximum of 34°C (94°F), with an average of 23°C (73°F) and 66 mm (2.6 in) of precipitation over 7 days. In contrast, January sees a minimum temperature of 14°C (58°F) and can reach up to 37°C (99°F), with an average of 25°C (77°F) and slightly less precipitation at 59 mm (2.3 in) over 6 days. Additionally, January's humidity level drops to 50%, making it feel a bit drier compared to December's 56%. For more detailed information, check out Buenos Aires weather in January.
In December, the weather is characterized by a minimum temperature of 10°C (50°F) and an average around 23°C (73°F), peaking at a maximum of 34°C (94°F). The month sees a total precipitation of 66 mm (2.6 in) over approximately 7 days, with humidity hovering around 56%. In contrast, February experiences slightly warmer nights, with a minimum temperature of 13°C (55°F) and a similar average of 23°C (75°F), while the maximum only dips slightly to 33°C (92°F). February also brings a bit more rain, with 72 mm (2.9 in) of precipitation over 8 days and a higher humidity level of 61%. For more detailed weather information, you can check out Buenos Aires weather in February.
In December, temperatures in Buenos Aires range from a minimum of 10°C (50°F) to a maximum of 34°C (94°F), with an average of 23°C (73°F). The month experiences about 66 mm (2.6 in) of precipitation over 7 days, coupled with a humidity level of 56%. In contrast, March sees slightly cooler temperatures, with a minimum of 10°C (51°F) and a maximum of 32°C (89°F), averaging 22°C (71°F). Precipitation increases to 77 mm (3.0 in) spread across 8 days, along with a rise in humidity to 66%. For more detailed information on the weather, check out Buenos Aires weather in March.
December and April present contrasting weather patterns. In December, the temperatures range from a mild 10°C (50°F) to a hot 34°C (94°F), with an average of 23°C (73°F) and relatively low humidity at 56%. Precipitation is moderate, with 66 mm (2.6 in) falling over about 7 days. In April, however, the temperatures are cooler, with a minimum of 6°C (44°F) and a maximum of 29°C (84°F), averaging 19°C (66°F). This month sees higher humidity at 80% and increased rainfall, totaling 82 mm (3.2 in) over 8 days. For more detailed insights, check out Buenos Aires weather in April.
In December, the weather is notably warmer, with temperatures ranging from a minimum of 10°C (50°F) to a maximum of 34°C (94°F) and an average of 23°C (73°F). The month experiences moderate humidity levels at 56% and features 66 mm (2.6 in) of precipitation over about seven days. In contrast, May sees cooler conditions, with temperatures ranging from a minimum of 4°C (39°F) to a maximum of 25°C (77°F), and an average of only 15°C (59°F). This month is characterized by higher humidity at 85% and slightly more precipitation at 80 mm (3.2 in) over the same number of days. For a more detailed look at the climate specifics, you can check Buenos Aires weather in May.
When comparing the weather in December and June, it's evident that these two months present contrasting climates. December experiences much warmer temperatures, with a minimum of 10°C (50°F) and an average high of 34°C (94°F), while June is considerably cooler, with temperatures dipping to a minimum of 1°C (35°F) and an average maximum of 23°C (74°F). Both months have similar precipitation levels, around 66 mm (2.6 in), but June sees slightly more rainy days at 8 compared to December's 7. Additionally, humidity levels in June are higher at 80%, making the air feel more damp, in contrast to December's 56%. For more detailed information on the climate during this month, you can check out Buenos Aires weather in June.
The weather in Buenos Aires varies significantly between December and July. In December, temperatures soar, with minimums often around 10°C (50°F) and maximums reaching up to 34°C (94°F), yielding an average of 23°C (73°F). The month experiences around 66 mm (2.6 in) of precipitation over about 7 days, and humidity levels are moderate at 56%.
Conversely, July brings much cooler conditions, with minimum temperatures dipping to 1°C (34°F) and maximums only reaching 23°C (74°F), resulting in a much lower average of 11°C (52°F). Rainfall is slightly higher at 75 mm (3.0 in) across 8 days, and humidity is also elevated at 69%. For more detailed insights, you can check out Buenos Aires weather in July.
When comparing the weather in December and August, there is a noticeable contrast in temperatures and humidity. December boasts a warmer climate with minimum temperatures around 10°C (50°F) and maximums reaching up to 34°C (94°F), resulting in an average of 23°C (73°F). Additionally, it experiences 66 mm (2.6 in) of precipitation over about 7 days, with a moderate humidity of 56%. In contrast, August presents much cooler weather, where temperatures dip to a minimum of 2°C (36°F) and peak at 24°C (75°F), averaging at 12°C (55°F). Precipitation in August is slightly lower at 51 mm (2.0 in) over approximately 5 days, but humidity is higher at 66%. For more details on August weather, you can check out Buenos Aires weather in August.
When comparing the weather in December and September, it becomes evident that December tends to be significantly warmer and drier. December boasts average temperatures ranging from a low of 10°C (50°F) to a high of 34°C (94°F), while September features a cooler climate with temperatures from 3°C (38°F) to 27°C (81°F). Additionally, December experiences less precipitation at 66 mm (2.6 in) over seven days compared to September's 86 mm (3.4 in) over six days. It's also noteworthy that humidity levels are higher in September at 72%, compared to December's 56%. For those looking for more details about September weather specifically, you can visit Buenos Aires weather in September.
In comparing the weather conditions of December and October, we observe several notable differences. December boasts higher temperatures, with a minimum of 10°C (50°F), an average of 23°C (73°F), and a maximum reaching 34°C (94°F), while October is cooler, presenting a minimum of 7°C (45°F), an average of 17°C (63°F), and a maximum of 30°C (87°F). Additionally, December experiences less precipitation, with 66 mm (2.6 in) over 7 days, compared to October's 103 mm (4.1 in) spread over 10 days. Humidity levels also vary, as October is slightly more humid at 63%, compared to December's 56%. For more detailed insights, you can explore Buenos Aires weather in October.
In comparing the weather patterns of December and November, December is slightly warmer, with average temperatures peaking at 23°C (73°F) and maximums reaching 34°C (94°F), compared to November's average of 21°C (69°F) and a maximum of 33°C (91°F). Precipitation is somewhat lower in December, totaling 66 mm (2.6 in) over 7 days, while November sees 77 mm (3.0 in) of rain spread over 8 days. Additionally, humidity levels are slightly lower in December at 56% compared to November's 59%. For further details on November's weather, you can check Buenos Aires weather in November.
December in Buenos Aires brings a vibrant shift towards summer, marked by warmer temperatures and increased humidity compared to the cooler months. As the city basks in the sun, expect average highs around 23°C (73°F), with peaks soaring to 34°C (94°F), inviting everyone to enjoy outdoor festivities. While rain can make an occasional appearance, with about 7 days of precipitation, it often adds a refreshing element to the heat rather than dampening the holiday spirit. Embrace the blooming energy of the city during this time and explore more about the unique characteristics of Buenos Aires weather by checking out Buenos Aires Climate.