18-Night Cruise on Diamond PrincessGrand Circle Japan - Weather

Join Princess Cruises's Diamond Princess for a 18-night voyage on the Grand Circle Japan route, setting out from Yokohama, Japan on October 1, 2026. It's a classic Asia cruise. Travelers sailing in October can generally expect cooler, off-season conditions. Ports of call include Yokohama, Japan, Toba, Japan, Kobe/Osaka, Japan, with 12 more along the way. The forecasts below break the weather down port by port.

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

   Yokohama, Japan is a scheduled port of call on day 1 of the 18-night Grand Circle Japan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 75°F.

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

   Toba, Japan is a scheduled port of call on day 2 of the 18-night Grand Circle Japan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 76°F.

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

   Kobe/Osaka, Japan is a scheduled port of call on day 3 of the 18-night Grand Circle Japan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 77°F.

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

   Kochi, Japan is a scheduled port of call on day 4 of the 18-night Grand Circle Japan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 78°F.

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

   Hiroshima, Japan is a scheduled port of call on day 5 of the 18-night Grand Circle Japan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 78°F.

6. Day 6 — Wednesday, Oct 7, 2026 — Busan, South Korea

   Busan, South Korea is a scheduled port of call on day 6 of the 18-night Grand Circle Japan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 69°F.

7. Day 7 — Thursday, Oct 8, 2026 — Nagasaki, Japan

   Nagasaki, Japan is a scheduled port of call on day 7 of the 18-night Grand Circle Japan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 79°F.

8. Day 8 — Saturday, Oct 10, 2026 — Yokohama, Japan

   Yokohama, Japan is a scheduled port of call on day 8 of the 18-night Grand Circle Japan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 73°F.

9. Day 9 — Monday, Oct 12, 2026 — Akita, Japan

   Akita, Japan is a scheduled port of call on day 9 of the 18-night Grand Circle Japan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 67°F.

10. Day 10 — Tuesday, Oct 13, 2026 — Toyama, Japan

    Toyama, Japan is a scheduled port of call on day 10 of the 18-night Grand Circle Japan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 61°F.

11. Day 11 — Wednesday, Oct 14, 2026 — Tsuruga, Japan

    Tsuruga, Japan is a scheduled port of call on day 11 of the 18-night Grand Circle Japan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 70°F.

12. Day 12 — Thursday, Oct 15, 2026 — Sakaiminato, Japan

    Sakaiminato, Japan is a scheduled port of call on day 12 of the 18-night Grand Circle Japan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 69°F.

13. Day 13 — Friday, Oct 16, 2026 — Busan, South Korea

    Busan, South Korea is a scheduled port of call on day 13 of the 18-night Grand Circle Japan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 67°F.

14. Day 14 — Saturday, Oct 17, 2026 — Nagasaki, Japan

    Nagasaki, Japan is a scheduled port of call on day 14 of the 18-night Grand Circle Japan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 76°F.

15. Day 15 — Monday, Oct 19, 2026 — Yokohama, Japan

    Yokohama, Japan is a scheduled port of call on day 15 of the 18-night Grand Circle Japan cruise on Diamond Princess. Expected weather: partially cloudy with highs near 69°F.