9-Night Cruise on Norwegian VivaGreek Isles from Istanbul to Rome: Santorini, Athens & Mykonos - Weather

Join Norwegian Cruise Line (NCL)'s Norwegian Viva for a 9-night voyage on the Greek Isles from Istanbul to Rome: Santorini, Athens & Mykonos route, setting out from Istanbul, Turkey on July 13, 2026. It's a classic Mediterranean cruise. Travelers sailing in July can generally expect mild, changeable weather that can turn cool and wet. Ports of call include Istanbul, Turkey, Kusadasi, Turkey, Piraeus, Greece, with 7 more along the way. The forecasts below break the weather down port by port.

1. Day 1 — Monday, Jul 13, 2026 — Istanbul, Turkey

   Istanbul, Turkey is a scheduled port of call on day 1 of the 9-night Greek Isles from Istanbul to Rome: Santorini, Athens & Mykonos cruise on Norwegian Viva. Expected weather: clear with highs near 82°F.

2. Day 2 — Tuesday, Jul 14, 2026 — Kusadasi, Turkey

   Kusadasi, Turkey is a scheduled port of call on day 2 of the 9-night Greek Isles from Istanbul to Rome: Santorini, Athens & Mykonos cruise on Norwegian Viva. Expected weather: clear with highs near 90°F.

3. Day 3 — Wednesday, Jul 15, 2026 — Piraeus, Greece

   Piraeus, Greece is a scheduled port of call on day 3 of the 9-night Greek Isles from Istanbul to Rome: Santorini, Athens & Mykonos cruise on Norwegian Viva. Expected weather: clear with highs near 95°F.

4. Day 4 — Thursday, Jul 16, 2026 — Mykonos, Greece

   Mykonos, Greece is a scheduled port of call on day 4 of the 9-night Greek Isles from Istanbul to Rome: Santorini, Athens & Mykonos cruise on Norwegian Viva. Expected weather: clear with highs near 80°F.

5. Day 5 — Friday, Jul 17, 2026 — Santorini, Greece

   Santorini, Greece is a scheduled port of call on day 5 of the 9-night Greek Isles from Istanbul to Rome: Santorini, Athens & Mykonos cruise on Norwegian Viva. Expected weather: clear with highs near 78°F.

6. Day 6 — Saturday, Jul 18, 2026 — Katakolon, Greece

   Katakolon, Greece is a scheduled port of call on day 6 of the 9-night Greek Isles from Istanbul to Rome: Santorini, Athens & Mykonos cruise on Norwegian Viva. Expected weather: clear with highs near 86°F.

7. Day 7 — Sunday, Jul 19, 2026 — La Valletta, Malta

   La Valletta, Malta is a scheduled port of call on day 7 of the 9-night Greek Isles from Istanbul to Rome: Santorini, Athens & Mykonos cruise on Norwegian Viva. Expected weather: clear with highs near 88°F.

8. Day 8 — Monday, Jul 20, 2026 — Catania, Sicily

   Catania, Sicily is a scheduled port of call on day 8 of the 9-night Greek Isles from Istanbul to Rome: Santorini, Athens & Mykonos cruise on Norwegian Viva. Expected weather: partially cloudy with highs near 106°F.

9. Day 9 — Tuesday, Jul 21, 2026 — Salerno, Italy

   Salerno, Italy is a scheduled port of call on day 9 of the 9-night Greek Isles from Istanbul to Rome: Santorini, Athens & Mykonos cruise on Norwegian Viva. Expected weather: clear with highs near 92°F.

10. Day 10 — Wednesday, Jul 22, 2026 — Civitavecchia, Italy

    Civitavecchia, Italy is a scheduled port of call on day 10 of the 9-night Greek Isles from Istanbul to Rome: Santorini, Athens & Mykonos cruise on Norwegian Viva. Expected weather: clear with highs near 81°F.