MyCruiseForecast

Saga, Japan

Karatsu cruise weather by month

What to expect when your ship is in Karatsu in any month: temperatures, how often it rains, wind, sea temperature and wave heights.

Weather in Karatsu by month

Average highs run from 49°F (10°C) in January to 87°F (31°C) in August. Rain falls on the fewest days in October and the most in July. Sea temperature and wave heights are for the water just off the port.

Typical conditions, 2022–2025 climate record (ECMWF). Rain days are days with at least 1 mm of rain or melted snow. These are averages, not a forecast.
MonthHigh / lowRain daysWindSea tempTypical seas
January49 / 37°F10 / 3°C33%11 mph19 km/h58°F14°C2 ft (0.7 m)Slight; rougher days up to 4 ft
February50 / 38°F10 / 3°C36%12 mph20 km/h55°F13°C2 ft (0.7 m)Slight; rougher days up to 4 ft
March59 / 45°F15 / 7°C38%12 mph20 km/h57°F14°C2 ft (0.5 m)Slight; rougher days up to 4 ft
April66 / 51°F19 / 11°C37%12 mph19 km/h61°F16°C1 ft (0.4 m)Smooth; rougher days up to 3 ft
May70 / 60°F21 / 16°C38%14 mph23 km/h66°F19°C1 ft (0.4 m)Smooth; rougher days up to 3 ft
June77 / 68°F25 / 20°C49%12 mph20 km/h73°F23°C1 ft (0.3 m)Smooth; rougher days up to 2 ft
July86 / 77°F30 / 25°C50%13 mph21 km/h81°F27°C1 ft (0.3 m)Smooth; rougher days up to 1 ft
August87 / 79°F31 / 26°C48%13 mph21 km/h84°F29°C1 ft (0.3 m)Smooth; rougher days up to 2 ft
September83 / 75°F28 / 24°C45%14 mph23 km/h83°F28°C1 ft (0.4 m)Smooth; rougher days up to 3 ft
October73 / 60°F23 / 16°C27%11 mph17 km/h75°F24°C2 ft (0.6 m)Slight; rougher days up to 3 ft
November64 / 50°F18 / 10°C30%11 mph17 km/h69°F21°C2 ft (0.5 m)Slight; rougher days up to 3 ft
December52 / 41°F11 / 5°C31%12 mph20 km/h61°F16°C2 ft (0.7 m)Slight; rougher days up to 4 ft

Check the forecast for your sailing

Upcoming cruises in Karatsu

1 ship from 1 cruise line is scheduled here, 3 visits in total. The next 3:

DateShipStopSailing
Tue, Oct 132026Star SeekerWindstar CruisesCalls10 nights from Yokohama
Mon, Oct 192026Star SeekerWindstar CruisesCalls10 nights from Kobe/Osaka
Mon, Nov 22026Star SeekerWindstar CruisesCalls41 nights from Tokyo

Ships that visit Karatsu

Nearby cruise ports

Wave heights are significant wave height on the Douglas sea state scale. What the numbers mean for a cruise. Sources and method are on the about page.