Argentina’s diverse geography stretches from the subtropical north to subpolar southern Patagonia, making timing crucial. In general, the country’s summer (December–February) suits exploration of Patagonia’s glaciers and hiking trails around El Calafate or Ushuaia, though high-season prices prevail. For Buenos Aires, spring (September–November) or autumn (March–May) is delightful, combining mild weather with fewer tourists. The wine region of Mendoza is particularly appealing in autumn (March–April) during the grape harvest, and the northwest sees pleasant conditions outside the hottest months of January–February. Winter (June–August) can be chilly in Buenos Aires and prime for skiing in Bariloche. Ultimately, if you want to experience a broad sweep of Argentina’s highlights—from Iguazú Falls to Tierra del Fuego—consider spring or early autumn, balancing comfortable weather and diverse regional climates.
January: Peak summer in Buenos Aires, hot in lowlands, Patagonia prime.
February: Still summer, Carnival in northern provinces, Patagonia crowds.
March: Start of autumn, wine harvest festivals in Mendoza.
April: Mild weather, scenic foliage in Andean regions.
May: Cooler in the south, pleasant in central, fewer tourists.
June: Early winter, good for skiing in Bariloche.
July: Height of ski season, winter holidays for locals.
August: Late winter, Patagonia still cold but beautiful landscapes.
September: Spring begins, wildflowers in mountain areas.
October: Mild in Buenos Aires, good for Iguazú Falls with moderate water.
November: Pleasant temps, ideal for wide-ranging exploration.
December: Summer heats up, holiday festivities, Patagonia best season.