10-Night Cruise on Oceania SirenaVisions of Byzantium Barcelona to Istanbul - Weather

The Oceania Sirena sails a 10-night Visions of Byzantium Barcelona to Istanbul itinerary with Oceania Cruises, departing Barcelona, Spain on August 17, 2026. It's a classic Mediterranean cruise. Travelers sailing in August can generally expect mild, changeable weather that can turn cool and wet. Ports of call include Barcelona, Spain, Palermo, Sicily, Siracusa, Sicily, with 7 more along the way. Use the day-by-day forecast below to plan what to pack for each stop.

1. Day 1 — Monday, Aug 17, 2026 — Barcelona, Spain

   Barcelona, Spain is a scheduled port of call on day 1 of the 10-night Visions of Byzantium Barcelona to Istanbul cruise on Oceania Sirena. Expected weather: partially cloudy with highs near 79°F.

2. Day 2 — Wednesday, Aug 19, 2026 — Palermo, Sicily

   Palermo, Sicily is a scheduled port of call on day 2 of the 10-night Visions of Byzantium Barcelona to Istanbul cruise on Oceania Sirena. Expected weather: clear with highs near 92°F.

3. Day 3 — Thursday, Aug 20, 2026 — Siracusa, Sicily

   Siracusa, Sicily is a scheduled port of call on day 3 of the 10-night Visions of Byzantium Barcelona to Istanbul cruise on Oceania Sirena. Expected weather: clear with highs near 82°F.

4. Day 4 — Friday, Aug 21, 2026 — Argostoli, Greece

   Argostoli, Greece is a scheduled port of call on day 4 of the 10-night Visions of Byzantium Barcelona to Istanbul cruise on Oceania Sirena. Expected weather: clear with highs near 83°F.

5. Day 5 — Saturday, Aug 22, 2026 — Gythion, Greece

   Gythion, Greece is a scheduled port of call on day 5 of the 10-night Visions of Byzantium Barcelona to Istanbul cruise on Oceania Sirena. Expected weather: clear with highs near 84°F.

6. Day 6 — Sunday, Aug 23, 2026 — Paros, Greece

   Paros, Greece is a scheduled port of call on day 6 of the 10-night Visions of Byzantium Barcelona to Istanbul cruise on Oceania Sirena. Expected weather: clear with highs near 73°F.

7. Day 7 — Monday, Aug 24, 2026 — Piraeus, Greece

   Piraeus, Greece is a scheduled port of call on day 7 of the 10-night Visions of Byzantium Barcelona to Istanbul cruise on Oceania Sirena. Expected weather: clear with highs near 93°F.

8. Day 8 — Tuesday, Aug 25, 2026 — Kusadasi, Turkey

   Kusadasi, Turkey is a scheduled port of call on day 8 of the 10-night Visions of Byzantium Barcelona to Istanbul cruise on Oceania Sirena. Expected weather: clear with highs near 94°F.

9. Day 9 — Wednesday, Aug 26, 2026 — Bozcaada

   Bozcaada is a scheduled port of call on day 9 of the 10-night Visions of Byzantium Barcelona to Istanbul cruise on Oceania Sirena. Expected weather: clear with highs near 79°F.

10. Day 10 — Thursday, Aug 27, 2026 — Istanbul, Turkey

    Istanbul, Turkey is a scheduled port of call on day 10 of the 10-night Visions of Byzantium Barcelona to Istanbul cruise on Oceania Sirena. Expected weather: partially cloudy with highs near 82°F.