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Loading Travel Forecast…Loading Travel Forecast…Loading Travel Forecast…The Costa Diadema sails a 7-night South America from Buenos Aires itinerary with Costa Cruises, departing Buenos Aires, Argentina on December 23, 2026. The route makes 5 scheduled stops. Travelers sailing in December can generally expect cooler, off-season conditions. Ports of call include Buenos Aires, Argentina, Montevideo, Uruguay, Itajai, Brazil, with 2 more along the way. Use the day-by-day forecast below to plan what to pack for each stop.
Buenos Aires, Argentina is a scheduled port of call on day 1 of the 7-night South America from Buenos Aires cruise on Costa Diadema. Expected weather: partially cloudy with highs near 81°F.
Montevideo, Uruguay is a scheduled port of call on day 2 of the 7-night South America from Buenos Aires cruise on Costa Diadema. Expected weather: partially cloudy with highs near 73°F.
Itajai, Brazil is a scheduled port of call on day 3 of the 7-night South America from Buenos Aires cruise on Costa Diadema. Expected weather: partially cloudy with highs near 83°F.
Santos, Brazil is a scheduled port of call on day 4 of the 7-night South America from Buenos Aires cruise on Costa Diadema. Expected weather: partially cloudy with highs near 78°F.
Buenos Aires, Argentina is a scheduled port of call on day 5 of the 7-night South America from Buenos Aires cruise on Costa Diadema. Expected weather: partially cloudy with highs near 82°F.
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