10-Night Cruise on Norwegian VivaGreek Isles from Venice to Istanbul: Santorini & Athens - Weather

Join Norwegian Cruise Line (NCL)'s Norwegian Viva for a 10-night voyage on the Greek Isles from Venice to Istanbul: Santorini & Athens route, setting out from Ravenna, Italy on August 28, 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 Ravenna, Italy, Dubrovnik, Croatia, Bar, Montenegro, with 6 more along the way. The forecasts below break the weather down port by port.

1. Day 1 — Friday, Aug 28, 2026 — Ravenna, Italy

   Ravenna, Italy is a scheduled port of call on day 1 of the 10-night Greek Isles from Venice to Istanbul: Santorini & Athens cruise on Norwegian Viva. Expected weather: partially cloudy with highs near 83°F.

2. Day 2 — Saturday, Aug 29, 2026 — Dubrovnik, Croatia

   Dubrovnik, Croatia is a scheduled port of call on day 2 of the 10-night Greek Isles from Venice to Istanbul: Santorini & Athens cruise on Norwegian Viva. Expected weather: partially cloudy with highs near 81°F.

3. Day 3 — Sunday, Aug 30, 2026 — Bar, Montenegro

   Bar, Montenegro is a scheduled port of call on day 3 of the 10-night Greek Isles from Venice to Istanbul: Santorini & Athens cruise on Norwegian Viva. Expected weather: partially cloudy with highs near 78°F.

4. Day 4 — Tuesday, Sep 1, 2026 — Piraeus, Greece

   Piraeus, Greece is a scheduled port of call on day 4 of the 10-night Greek Isles from Venice to Istanbul: Santorini & Athens cruise on Norwegian Viva. Expected weather: clear with highs near 91°F.

5. Day 5 — Wednesday, Sep 2, 2026 — Santorini, Greece

   Santorini, Greece is a scheduled port of call on day 5 of the 10-night Greek Isles from Venice to Istanbul: Santorini & Athens cruise on Norwegian Viva. Expected weather: clear with highs near 77°F.

6. Day 6 — Thursday, Sep 3, 2026 — Rhodes, Greece

   Rhodes, Greece is a scheduled port of call on day 6 of the 10-night Greek Isles from Venice to Istanbul: Santorini & Athens cruise on Norwegian Viva. Expected weather: clear with highs near 82°F.

7. Day 7 — Friday, Sep 4, 2026 — Kusadasi, Turkey

   Kusadasi, Turkey is a scheduled port of call on day 7 of the 10-night Greek Isles from Venice to Istanbul: Santorini & Athens cruise on Norwegian Viva. Expected weather: clear with highs near 91°F.

8. Day 8 — Saturday, Sep 5, 2026 — Thessaloniki, Greece

   Thessaloniki, Greece is a scheduled port of call on day 8 of the 10-night Greek Isles from Venice to Istanbul: Santorini & Athens cruise on Norwegian Viva. Expected weather: partially cloudy with highs near 86°F.

9. Day 9 — Sunday, Sep 6, 2026 — Istanbul, Turkey

   Istanbul, Turkey is a scheduled port of call on day 9 of the 10-night Greek Isles from Venice to Istanbul: Santorini & Athens cruise on Norwegian Viva. Expected weather: partially cloudy with highs near 80°F.