December in Mendoza marks the height of summer in Argentina, transforming the region into a vibrant landscape of sun-drenched vineyards and bustling outdoor cafés. As the final month of the year, it delivers on the promise of long, lazy days perfect for exploring the Andes foothills. This period sees temperatures consistently climbing, creating an inviting atmosphere for both locals and international visitors seeking a warm escape. Understanding the specific characteristics of Mendoza Argentina weather in December allows for optimal planning of activities, from wine tours to mountain adventures.
Summer Heat and Sunny Skies
The dominant feature of Mendoza weather in December is the intense summer heat. Average daytime temperatures typically range between 28°C and 33°C (82°F to 91°F), although heatwaves can push thermometer readings significantly higher. Nights provide little relief, often remaining pleasantly warm at around 18°C to 22°C (64°F to 72°F). The defining characteristic of the season is the extraordinary amount of sunshine; the city enjoys over 12 hours of daylight with clear, blue skies dominating the majority of the month. This relentless sun is a key component of the region’s summer identity, creating a dry and desert-like feel that is characteristic of the Cuyo region.
Rainfall and Humidity Levels
December is generally one of the drier months in Mendoza, aligning with the summer season's low precipitation pattern. Rainfall is infrequent and usually manifests as brief, isolated afternoon showers rather than prolonged downpours. When rain does occur, it is typically light and clears quickly, leaving the air feeling fresh. Humidity levels remain comfortably low throughout the month, often hovering below 40%. This lack of muggy conditions is a major factor in why the heat, while strong, does not feel oppressive, allowing for comfortable outdoor activities well into the evening.
What to Pack for Mendoza in December
Packing for Mendoza in December requires a focus on lightweight, breathable fabrics and aggressive sun protection. Linen and cotton clothing are essential to stay cool during the peak heat hours between 11:00 and 16:00. A high-quality sunscreen with a high SPF is non-negotiable, as the UV index is extremely high. Sunglasses and a wide-brimmed hat are crucial accessories. While days are hot, evenings can be surprisingly cool, so bringing a light jacket or cardigan is highly recommended for dining outdoors or visiting air-conditioned indoor spaces.
Outdoor Activities and Lifestyle
The reliable weather in December dictates the rhythm of life in Mendoza. Mornings are often favored for more strenuous activities such as hiking in the nearby foothills or the beginning of a winery tour, when temperatures are more moderate. Afternoons are typically reserved for leisurely lunches, poolside relaxation at hotels, or exploring the shaded streets of historic districts in the city center. The warm weather also creates ideal conditions for the region’s famous nightlife, with locals and tourists gathering in plazas and outdoor bars long after sunset. The extended daylight hours mean more time to experience the natural beauty and hospitality of the region.
Wine Harvest Season
December is a critical month for the viticulture industry in Mendoza, marking the peak of the grape harvest. The combination of hot days and clear skies is perfect for achieving optimal sugar levels in the grapes. Visitors to the region during this time can witness the energy and bustle of the harvest, with many wineries offering special tours and tastings focused on the new vintage. The warm weather accelerates the ripening process, contributing to the bold and fruit-forward characteristics that define Malbecs from this region. It is a dynamic time to observe the agricultural cycle that defines the local economy.
