Summer conditions return with hot weather in many regions and high demand at beaches and Patagonia's northern gateways. Book early for festive-season travel and major domestic holiday weekends.
Average daily low and high (°C) and monthly rainfall. The badge shows how it feels, allowing for humidity.
Average temperature across Argentina in December.
Salta, Jujuy, Quebrada de Humahuaca, Cafayate
December is warm and humid, marking the start of the pronounced wet season: long sunlit mornings often give way to hot, stormy afternoons. This is peak growth time for the valley flora and hotel occupancy rises in popular towns like Salta; the salt flats remain accessible in dry spells but can be flooded after heavy rains. Bring quick-drying clothes, an umbrella for sudden showers, and expect vibrant skies at dusk after storms.
Iguazú, Misiones, Corrientes, Entre Ríos
December returns the full tropical heat and high humidity, and the rainforest enters its wettest phase with intense afternoon downpours and occasional flooding in lowlands. Iguazú is at its most powerful and photogenic, but visiting trails can be saturated; boat rides may be operated with higher caution. Expect school-holiday crowds; book lodgings early and pack waterproof footwear and repellant.
Mendoza, San Juan, Uco Valley, Aconcagua approach
December signals full-summer conditions: hot afternoons, lively terraces, and busy vineyards as tourism peaks. Afternoon thunderstorms can punctuate the heat, especially near the mountains, but most days are ideal for al fresco meals and evening strolls through the city. For those planning climbs toward Aconcagua basecamp, acclimatization and careful weather planning become priorities.
Buenos Aires city, La Plata, Mar del Plata, Rosario, Tigre
December heats up and humidity returns, reviving the high-season beach vibe along the coast and the city’s outdoor terraces. Storms can be intense and brief; keep an eye on weather apps during long rides and river trips in the Tigre delta. Expect busy travel and higher prices for hotels as both domestic and international visitors arrive to enjoy the summer.
Bariloche, San Martín de los Andes, Neuquén, El Bolsón
December signals full summer - long, warm days interspersed with brisk, windy afternoons; the Lakes district is in high season with lively bars and full bookings. Mountain trails are open and scenic drives are at their best before the Antarctic influence grows in later months; sunscreen, windproofs and a hat are travel essentials. Reserve accommodation and boat trips early for holidays.
El Calafate, El Chaltén, Ushuaia, Puerto Madryn, Península Valdés
December is becoming summer-like but remains cooler and much windier than in northern Patagonia; long days are excellent for glacier excursions and for visiting Tierra del Fuego’s trails. Whale-watching continues through the southern spring into early summer and Península Valdés is lively with wildlife; holiday crowds grow around national parks and coastal towns. Bring layered clothing, a warm hat and secure footwear for often-windy shorelines.
Year-end holidays bring domestic and international visitors to coastal and lake destinations, with higher hotel rates and busy resorts.
See how December compares with the rest of the year, then read the full guide.