18-Night Cruise on Diamond PrincessGrand Japan with Okinawa & Taiwan - Weather

The Diamond Princess sails a 18-night Grand Japan with Okinawa & Taiwan itinerary with Princess Cruises, departing Yokohama, Japan on September 22, 2026. It's a classic Asia cruise. Travelers sailing in September can generally expect cooler, off-season conditions. Ports of call include Yokohama, Japan, Keelung, Taiwan, Ishigaki, Japan, with 9 more along the way. Use the day-by-day forecast below to plan what to pack for each stop.

1. Day 1 — Tuesday, Sep 22, 2026 — Yokohama, Japan

   Yokohama, Japan is a scheduled port of call on day 1 of the 18-night Grand Japan with Okinawa & Taiwan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 78°F.

2. Day 2 — Friday, Sep 25, 2026 — Keelung, Taiwan

   Keelung, Taiwan is a scheduled port of call on day 2 of the 18-night Grand Japan with Okinawa & Taiwan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 80°F.

3. Day 3 — Sunday, Sep 27, 2026 — Ishigaki, Japan

   Ishigaki, Japan is a scheduled port of call on day 3 of the 18-night Grand Japan with Okinawa & Taiwan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 83°F.

4. Day 4 — Monday, Sep 28, 2026 — Naha, Japan

   Naha, Japan is a scheduled port of call on day 4 of the 18-night Grand Japan with Okinawa & Taiwan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 82°F.

5. Day 5 — Thursday, Oct 1, 2026 — Yokohama, Japan

   Yokohama, Japan is a scheduled port of call on day 5 of the 18-night Grand Japan with Okinawa & Taiwan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 75°F.

6. Day 6 — Friday, Oct 2, 2026 — Toba, Japan

   Toba, Japan is a scheduled port of call on day 6 of the 18-night Grand Japan with Okinawa & Taiwan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 76°F.

7. Day 7 — Saturday, Oct 3, 2026 — Kobe/Osaka, Japan

   Kobe/Osaka, Japan is a scheduled port of call on day 7 of the 18-night Grand Japan with Okinawa & Taiwan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 77°F.

8. Day 8 — Sunday, Oct 4, 2026 — Kochi, Japan

   Kochi, Japan is a scheduled port of call on day 8 of the 18-night Grand Japan with Okinawa & Taiwan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 78°F.

9. Day 9 — Monday, Oct 5, 2026 — Hiroshima, Japan

   Hiroshima, Japan is a scheduled port of call on day 9 of the 18-night Grand Japan with Okinawa & Taiwan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 78°F.

10. Day 10 — Wednesday, Oct 7, 2026 — Busan, South Korea

    Busan, South Korea is a scheduled port of call on day 10 of the 18-night Grand Japan with Okinawa & Taiwan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 69°F.

11. Day 11 — Thursday, Oct 8, 2026 — Nagasaki, Japan

    Nagasaki, Japan is a scheduled port of call on day 11 of the 18-night Grand Japan with Okinawa & Taiwan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 79°F.

12. Day 12 — Saturday, Oct 10, 2026 — Yokohama, Japan

    Yokohama, Japan is a scheduled port of call on day 12 of the 18-night Grand Japan with Okinawa & Taiwan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 73°F.