Weather in Argentina in December

Argentina is arguably at its best in December, right in the heart of the Southern Hemisphere summer. Expect long days, plenty of sunshine, and a buzz of energy across the country. From the vibrant streets and rooftop bars of Buenos Aires to the sun-drenched beaches of Mar del Plata and the wine regions basking in warmth, December is prime time to explore. 

Here’s what to expect from the weather in Argentina in December.

Argentina in December at a glance

• Average temperatures range from 75-90°F (24-32°C), hotter in the north and central regions.
• Summer is in full swing, with dry, sunny weather in Buenos Aires, Mendoza, and the Pampas.
• Patagonia sees milder temps and long daylight hours, ideal for hiking and road trips.
• Beach destinations like Mar del Plata start filling up as locals begin summer vacations.
• Prices and crowds start to climb, especially around Christmas and New Year. Book early.

What is the weather like in Argentina in December?

If you’re planning a trip to Argentina, December kicks off the summer season, bringing long days, rising temperatures, and a lively vacation atmosphere across the country.

In Buenos Aires and central Argentina, daytime highs hover around 80-90°F (27-32°C), with plenty of sunshine and some humidity. It’s a great time to explore the capital’s parks, open-air cafés, and cultural festivals before locals head out of town for summer break.

Head south to Patagonia and you’ll find milder weather, perfect for hiking in El Chaltén or cruising past glaciers in El Calafate. The days are long, and conditions are ideal for outdoor adventures.

For beach time, December marks the start of the high season along the Atlantic coast. Mar del Plata and Pinamar are among the best beaches in Argentina, with wide sandy stretches, a buzzing nightlife scene, and warm waters. It’s a popular time for locals to travel, so book early.

This is easily the best time to visit Argentina, especially if you want to soak up sun, festivals, and wide-open landscapes at their most accessible.

Average daily temperatures in December

December marks the start of summer in Argentina, and the weather varies widely depending on where you go. In the north and central regions, expect long, hot days with highs often above 90°F (32°C), while Patagonia in the south offers milder conditions, ideal for hiking and road trips.

Buenos Aires and other central cities can feel humid, especially in the afternoons, so plan sightseeing for early or late in the day. In the mountains and wine regions, nights cool down just enough for a good night’s sleep. Days are long, with daylight stretching well past 8:30 PM in many regions.

Is December a good time to visit Argentina?

December is a fantastic time for Argentina trips, especially if you enjoy summer weather, outdoor activities, and a lively vacation atmosphere. It’s the start of the peak season, so popular destinations are full of energy, and early in the month, you can still beat the biggest crowds.

This is also a great time to visit Argentina with kids, with warm, school-vacation-friendly weather and plenty of family-friendly spots across the country. Think glacier tours in Patagonia, lake adventures in Bariloche, and beach time on the Atlantic coast.

Expect long, sunny days, especially in the north and central regions, with highs reaching 90°F (32°C) or more. Patagonia stays cooler, making it ideal for hiking and nature-focused travel.

Why December is a good time to visit:

• Summer weather: Most of the country is warm and sunny, perfect for outdoor adventures and long days exploring.
• Best family travel season: December is ideal for trips with kids, with school breaks, kid-friendly cities, and nature spots across the country.
• Patagonia at its best: Trails are open, the weather is mild, and the days are long, great for hiking and scenic drives.
• Beach season starts: Coastal towns like Mar del Plata are buzzing.
• Festive energy: From Christmas markets in Buenos Aires to New Year celebrations on the coast, the country is alive with summer spirit.

What about crowds and costs?

December in Argentina is the beginning of summer, attracting a surge in tourists eager to experience the festive season. Popular destinations, beaches, and cultural sites often become bustling with activity, leading to higher accommodation and travel costs.

Although the weather in Argentina in December is wonderful, you’ll want to be prepared for the peak-season prices.

Where to go in Argentina in December

Here are some of the best places to visit in Argentina in December, chosen to help you make the most of the summer weather and seasonal highlights.

Bariloche and the Lake District

Located in the Andes, Bariloche is surrounded by stunning lakes and mountains. It's a popular destination for outdoor activities such as hiking, fishing, and water sports. The scenery is breathtaking, and the chocolate in Bariloche is famous.

Iguazu Falls

A UNESCO World Heritage site, Iguazu Falls is one of the most impressive waterfall systems in the world. The subtropical climate makes it an excellent destination for nature lovers. Explore the national parks and take boat trips to get up close to the falls.

Mendoza

Famous for its vineyards and wineries, Mendoza is a great destination for wine enthusiasts. Or, if wine isn’t your cup of tea, you can also enjoy outdoor activities such as hiking and rafting in the nearby Andes.

Tucumán

This city is the gateway to the Argentine Northwest and is known for its historical significance. The weather in Argentina in December is warm and dry here, making it a great time to explore Tucumán’s colonial architecture, visit the Independence House, and use the city as a base for nearby natural attractions.

Best things to do in December

December is a great time to travel, and this is our pick of the top things to do in Argentina while the summer weather is in full swing.

Visit Bariloche's Christmas Market

Embrace the festive spirit in December by visiting Bariloche's Christmas Market. Nestled in the picturesque setting of the Argentine Andes, Bariloche transforms into a winter wonderland during the vacation season. 

The Christmas market, adorned with twinkling lights and vacation decorations, offers a delightful atmosphere. Here you can browse through stalls selling local crafts, artisanal goods, and seasonal treats.

Experience New Year's Eve in Buenos Aires

Celebrate the arrival of the new year in style by experiencing New Year's Eve in the vibrant metropolis of Buenos Aires. The city comes alive with lively street parties, spectacular fireworks displays, and a festive atmosphere. Join the locals in counting down to midnight at iconic locations like Puerto Madero or Plaza de Mayo.

Explore the Quebrada de Humahuaca

The weather in Argentina in December makes it an ideal time to explore the cultural and natural wonders of the Quebrada de Humahuaca. This UNESCO World Heritage Site in the Andean Northwest offers dramatic landscapes, charming villages, and a rich indigenous heritage.

Visit historic towns like Purmamarca and Tilcara, where you’ll find vibrant markets, ancient ruins, and warm, sunny days perfect for exploring.

Enjoy water sports in Mar del Plata

You may want to escape the summer heat in December by enjoying water sports in the coastal paradise of Mar del Plata. Known for its expansive beaches and vibrant seafront, Mar del Plata offers a plethora of activities, from surfing and kayaking to sailing and beach volleyball.

Join the locals and fellow travelers in the exhilarating water sports scene, or simply relax on the sandy shores and soak up the sun.

Visit Salta's Cathedral Basilica

Take the opportunity to experience the rich cultural and religious heritage of Salta by visiting the Cathedral Basilica in December. This historic cathedral, located in the heart of Salta City, showcases colonial architecture and intricate artwork.

As the city prepares for Christmas festivities, the cathedral becomes a focal point for religious celebrations and cultural events. 

Plan your trip with our Argentina itineraries

Our Argentina itineraries are crafted to help you experience the best of the country, stress-free. Think of them as a starting point, perfect for planning, but flexible enough to adjust to your own pace and interests. After all, travel is about freedom, but a little planning goes a long way.

• Argentina itinerary 7 days: A week in Argentina gives you a quick overview of the country’s highlights. Expect to experience a mix of city culture and one iconic natural destination.
• Argentina itinerary 14 days: Two weeks in Argentina lets you experience the country’s full diversity, from bustling cities to remote natural wonders.