4-Night Cruise on Costa DiademaSouth America from Itajai - Weather

Join Costa Cruises's Costa Diadema for a 4-night voyage on the South America from Itajai route, setting out from Itajai, Brazil on December 12, 2026. The route makes 4 scheduled stops. Travelers sailing in December can generally expect cooler, off-season conditions. Ports of call include Itajai, Brazil, Santos, Brazil, Ilhabela, Brazil, with 1 more along the way. The forecasts below break the weather down port by port.

1. Day 1 — Saturday, Dec 12, 2026 — Itajai, Brazil

   Itajai, Brazil is a scheduled port of call on day 1 of the 4-night South America from Itajai cruise on Costa Diadema. Expected weather: partially cloudy with highs near 80°F.

2. Day 2 — Sunday, Dec 13, 2026 — Santos, Brazil

   Santos, Brazil is a scheduled port of call on day 2 of the 4-night South America from Itajai cruise on Costa Diadema. Expected weather: partially cloudy with highs near 76°F.

3. Day 3 — Monday, Dec 14, 2026 — Ilhabela, Brazil

   Ilhabela, Brazil is a scheduled port of call on day 3 of the 4-night South America from Itajai cruise on Costa Diadema. Expected weather: partially cloudy with highs near 78°F.

4. Day 4 — Tuesday, Dec 15, 2026 — At Sea

   Day 4 of 5 is a day at sea aboard Costa Diadema, cruising between ports on the South America from Itajai itinerary.

5. Day 5 — Wednesday, Dec 16, 2026 — Itajai, Brazil

   Itajai, Brazil is a scheduled port of call on day 5 of the 4-night South America from Itajai cruise on Costa Diadema. Expected weather: partially cloudy with highs near 81°F.