December weather forecast
Buenos Aires, Argentina

December marks the beginning of summer in Buenos Aires, completing the cycle of seasons with warmth and sunshine. Average high and low temperatures rise to 29.2°C (84.6°F) and 17.8°C (64°F) respectively. It endorses plenty of sunshine, maximizing outdoor enjoyment during longer daylight hours. Despite being one of the windiest months, it experiences moderate rainfall. Sea temperatures peak, making December a prime time for beach excursions and water activities.

Temperature

Buenos Aires's weather in December shows a minor rise in the average high-temperature, moving slightly up from November's warm 25.3°C (77.5°F) to a still moderately hot 29.2°C (84.6°F). December in Buenos Aires generally records an average low-temperature of 17.8°C (64°F).

Heat index

December's heat index is evaluated at a tropical 31°C (87.8°F). With constant exposure and activity, a state of weariness might ensue, leading to potential heat cramps.
It is important to note that the heat index values are for shaded areas and light wind scenarios. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', shows a temperature sensation when both heat and moisture conditions are combined. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.

Humidity

In Buenos Aires, the average relative humidity in December is 58%.

Rainfall

In Buenos Aires, Argentina, during December, the rain falls for 9.5 days and regularly aggregates up to 69mm (2.72") of precipitation. Throughout the year, there are 108.2 rainfall days, and 629mm (24.76") of precipitation is accumulated.

Sea temperature

In Buenos Aires, the average seawater temperature in December is 22.6°C (72.7°F).
Note: When considering a person's aversion to cold, factors like sunshine, wind, and atmospheric temperature are key. Swimming in 22.6°C (72.7°F) might be delightful. (Remember: The Olympics' swimming events have water temperatures between 25°C (77°F) and 28°C (82.4°F).)

Daylight

The month with the longest days in Buenos Aires is December, with an average of 14h and 24min of daylight.
On the first day of December, sunrise is at 05:33 and sunset at 19:52. On the last day of the month, sunrise is at 05:43 and sunset at 20:09 -03.

Sunshine

The month with the most sunshine is December, with an average of 11.2h of sunshine.

UV index

The average daily maximum UV index in December is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum UV index, 6 during December, leads to the following recommendations:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Caution! The mirror effect of sand and water ups the UV radiation strength.