December weather forecast
Ha Long, Vietnam

The limestone rocks in Ha Long Bay, Vietnam, with cruise boats docked off the shores of the beautiful blue waters
The limestone rocks in Ha Long Bay, Vietnam, with cruise boats docked off the shores of the beautiful blue waters

Weather in December

December, the first month of the winter in Ha Long, is still a pleasant month, with an average temperature fluctuating between 14.1°C (57.4°F) and 21.5°C (70.7°F).

Temperature

In December, the average high-temperature slightly decreases from a moderately hot 25.9°C (78.6°F) in November to an agreeable 21.5°C (70.7°F). In Ha Long, the average low-temperature is 14.1°C (57.4°F).

Humidity

In Ha Long, the average relative humidity in December is 73%.

Rainfall

In December, in Ha Long, the rain falls for 12.9 days. Throughout December, 25mm (0.98") of precipitation is accumulated. In Ha Long, Vietnam, during the entire year, the rain falls for 237.1 days and collects up to 1472mm (57.95") of precipitation.

Sea temperature

In December, the average sea temperature in Ha Long is 21.6°C (70.9°F).
Note: For swimming, a surface water temperature of 21.6°C (70.9°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

Daylight

With an average of 10h and 53min of daylight, December has the shortest days of the year.
On the first day of December in Ha Long, sunrise is at 06:12 and sunset at 17:09. On the last day of the month, sunrise is at 06:28 and sunset at 17:21 +07.

Sunshine

In December, the average sunshine in Ha Long is 4.9h.

UV index

The months with the lowest UV index in Ha Long are January and December, with an average maximum UV index of 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 4 in December transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the temperature in December in Ha Long?

In December, the average high-temperature is 21.5°C (70.7°F), and the average low-temperature is 14.1°C (57.4°F). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in October is appraised at 34°C (93.2°F).

What is the average humidity in December in Ha Long?

In December, the average relative humidity in Ha Long, Vietnam, is 73%.

How many days does it rain in December in Ha Long?

In Ha Long, in December, during 12.9 rainfall days, 25mm (0.98") of precipitation is typically accumulated.

What is the sea temperature in December in Ha Long?

In Ha Long, the average seawater temperature in December is 21.6°C (70.9°F). For swimming, a surface water temperature of 21.6°C (70.9°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

What is the month with the shortest days in Ha Long?

The month with the shortest days is December, with an average of 10h and 53min of daylight.

How many hours of daylight does Ha Long have in December?

In Ha Long, the average day length in December is 10h and 53min.

When is the sunrise / sunset in December in Ha Long?

In December, on the first day of the month, sunrise is at 06:12 and sunset at 17:09. On the last day of the month, sunrise is at 06:28 and sunset at 17:21 +07.

How long on average sun shines in December in Ha Long?

The average sunshine duration in December in Ha Long, Vietnam, is 4.9h.

What are the months with the lowest UV index in Ha Long?

January and December, with an average maximum UV index of 4, are months with the lowest UV index.

How high is the UV index in December in Ha Long?

In Ha Long, the average daily maximum UV index in December is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from exposure to the Sun's UV radiation.

Average temperature in December
Ha Long, Vietnam

Average temperature in December - Ha Long, Vietnam
  • Average high temperature in December: 21.5°C

The warmest month (with the highest average high temperature) is June (34.1°C).
The month with the lowest average high temperature is January (20.1°C).

  • Average low temperature in December: 14.1°C

The month with the highest average low temperature is June (25.4°C).
The coldest month (with the lowest average low temperature) is January (13.7°C).

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Average pressure in December
Ha Long, Vietnam

Average pressure in December - Ha Long, Vietnam
  • Average pressure in December: 1019.2mbar

The month with the highest atmospheric pressure is December (1019.2mbar).
The month with the lowest atmospheric pressure is June (1003.4mbar).

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Average wind speed in December
Ha Long, Vietnam

Average wind speed in December - Ha Long, Vietnam
  • Average wind speed in December: 5.3km/h

The windiest month (with the highest average wind speed) is March (8.6km/h).
The calmest months (with the lowest average wind speed) are August and September (5.2km/h).

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Average humidity in December
Ha Long, Vietnam

Average humidity in December - Ha Long, Vietnam
  • Average humidity in December: 73%

The months with the highest relative humidity are August and September (83%).
The month with the lowest relative humidity is February (71%).

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Average rainfall in December
Ha Long, Vietnam

Average rainfall in December - Ha Long, Vietnam
  • Average rainfall in December: 25mm

The wettest month (with the highest rainfall) is August (317mm).
The driest month (with the least rainfall) is February (15mm).

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Average rainfall days in December
Ha Long, Vietnam

Average rainfall days in December - Ha Long, Vietnam
  • Average rainfall days in December: 12.9 days

The month with the highest number of rainy days is July (28.3 days).
The month with the least rainy days is February (12.8 days).

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Average sea temperature in December
Ha Long, Vietnam

Average sea temperature in December - Ha Long, Vietnam
  • Average sea temperature in December: 21.6°C

The best month for swimming (with the highest average sea temperature) is July (30.8°C).
The coldest months (with the lowest average sea temperature) are January and February (19.3°C).

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Average daylight in December /
Average sunshine in December
Ha Long, Vietnam

Average daylight in December / Average sunshine in December - Ha Long, Vietnam
  • Average daylight in December: 10h and 53min

The month with the longest days is June (Average daylight: 13h and 23min).
The month with the shortest days is December (Average daylight: 10h and 53min).

  • Average sunshine in December: 4h and 54min

The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

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Average sunshine days in December
Ha Long, Vietnam

Average sunshine days in December - Ha Long, Vietnam
  • Average sunshine days in December: 15.5 days

The month with the most sunshine days is December (15.5 days).
The month with the least sunshine days is July (2.3 days).

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Average UV index in December
Ha Long, Vietnam

Average UV index in December - Ha Long, Vietnam
  • Average UV index in December: 4

The months with the highest UV index are April, May, June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 4).

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Average cloud cover in December
Ha Long, Vietnam

Average cloud cover in December - Ha Long, Vietnam
  • Average cloud cover in December: 52

The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is June (Cloud cover 42).

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Average visibility in December
Ha Long, Vietnam

Average visibility in December - Ha Long, Vietnam
  • Average visibility in December: 9km

The months with the highest visibility are January, February, March, April, May, June, October, November and December (9km).
The months with the lowest visibility are July, August and September (8km).

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