Costa Cruises · 7 nights
Costa Diadema weather: 7-night cruise from Itajaí, December 19, 2026
The Costa Diadema (Costa Cruises) leaves Itajaí on December 19, 2026 for a 7-night cruise, with stops in Santos (Sao Paulo), Buenos Aires and Montevideo. It returns to Itajaí on December 26, 2026. Typical afternoon highs along the route run from 78°F to 87°F (26°C to 30°C), and 3 days are at sea, where seas are typically slight (around 3 ft).
Open the interactive forecast for this sailing
This page shows typical conditions for these dates. The interactive forecast adds a live day-by-day forecast, wave heights and weather alerts as the sailing gets closer.
Day-by-day itinerary and typical weather
| Day | Port | High / low | Rain days | Wind | Typical seas |
|---|---|---|---|---|---|
| Day 1Sat, Dec 19 | Itajaí Embark | 87 / 72°F30 / 22°C | 46% | 10 mph16 km/h | – |
| Day 2Sun, Dec 20 | Santos (Sao Paulo) | 84 / 72°F29 / 22°C | 49% | 9 mph14 km/h | – |
| Day 3Mon, Dec 21 | At sea | 84 / 70°F29 / 21°C | 34% | 9 mph14 km/h | 3 ft (0.9 m)Slight; rougher days up to 5 ft |
| Day 4Tue, Dec 22 | At sea | 84 / 70°F29 / 21°C | 34% | 9 mph14 km/h | 3 ft (0.9 m)Slight; rougher days up to 5 ft |
| Day 5Wed, Dec 23 | Buenos Aires | 84 / 68°F29 / 20°C | 19% | 15 mph24 km/h | – |
| Day 6Thu, Dec 24 | Montevideo | 78 / 65°F26 / 19°C | 26% | 16 mph26 km/h | – |
| Day 7Fri, Dec 25 | At sea | 82 / 69°F28 / 20°C | 36% | 10 mph16 km/h | 3 ft (0.8 m)Slight; rougher days up to 4 ft |
| Day 8Sat, Dec 26 | Itajaí Disembark | 87 / 72°F30 / 22°C | 46% | 10 mph16 km/h | – |
Seas are significant wave height, the average of the highest third of waves. What that means on board.
Ports on this cruise
- Santos (Sao Paulo)Weather by month
- Buenos AiresWeather by month
- MontevideoWeather by month
- ItajaíWeather by month
More Costa Diadema sailings
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