MyCruiseForecast

Vietnam

Ha Long Bay cruise weather by month

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

Weather in Ha Long Bay by month

Average highs run from 68°F (20°C) in February to 89°F (32°C) in July. Rain falls on the fewest days in December and the most in June. 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
January68 / 59°F20 / 15°C32%10 mph17 km/h65°F18°C2 ft (0.5 m)Smooth; rougher days up to 2 ft
February68 / 60°F20 / 15°C38%11 mph18 km/h65°F18°C2 ft (0.5 m)Smooth; rougher days up to 2 ft
March74 / 65°F23 / 18°C31%10 mph16 km/h69°F21°C1 ft (0.4 m)Smooth; rougher days up to 2 ft
April80 / 72°F27 / 22°C40%10 mph16 km/h78°F25°C2 ft (0.5 m)Smooth; rougher days up to 3 ft
May85 / 75°F29 / 24°C68%10 mph16 km/h84°F29°C2 ft (0.5 m)Smooth; rougher days up to 2 ft
June88 / 80°F31 / 27°C87%9 mph15 km/h88°F31°C2 ft (0.5 m)Slight; rougher days up to 3 ft
July89 / 80°F32 / 27°C82%10 mph16 km/h89°F32°C2 ft (0.5 m)Smooth; rougher days up to 3 ft
August88 / 79°F31 / 26°C87%9 mph14 km/h89°F32°C1 ft (0.4 m)Smooth; rougher days up to 3 ft
September87 / 77°F31 / 25°C77%10 mph16 km/h87°F30°C1 ft (0.3 m)Smooth; rougher days up to 3 ft
October82 / 73°F28 / 23°C30%11 mph19 km/h82°F28°C2 ft (0.5 m)Smooth; rougher days up to 2 ft
November79 / 69°F26 / 20°C22%11 mph18 km/h78°F25°C2 ft (0.5 m)Smooth; rougher days up to 2 ft
December70 / 60°F21 / 16°C9%11 mph17 km/h69°F20°C2 ft (0.5 m)Slight; rougher days up to 3 ft

Check the forecast for your sailing

Upcoming cruises in Ha Long Bay

2 ships from 1 cruise line are scheduled here, 2 visits in total. The next 2:

DateShipStopSailing
Thu, Oct 152026Viking VenusVikingCalls14 nights from Hong Kong
Tue, Nov 32026Viking OrionVikingCalls14 nights from Hong Kong

Ships that visit Ha Long Bay

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.