Halong Bay has the typical diurnal tide system (tide amplitude ranges from 3.5-4m). The salinity is from 31 to 34.5MT in the dry season and lower in the rainy season.

The best time of year to visit Halong Bay is during the spring or fall. Because the bay is situated in the northern part of the country, it can get colder in the fall and winter, and though you won't see extremes such as blizzards, it's still a lousy place to be when it gets cold. This area is one of the most popular destinations for vacations in Vietnam. Though there will be more tourists in the area in the spring and summer, the area is still a good place to go. In some situations, it's actually better that there are more people there. There will be more places to go for food and more entertainment in the area. When the weather is good you can go out in the bay on a junk, or a boat, and take a tour of the area. You can go swimming if you wish and just explore the beauty of the area. However, you can't do all of that in the fall and winter because it gets too cold. When you visit the area you should pack a swim suit, some shorts and a t-shirt. You should have enough clothes to keep you comfortable.

Temperature and Precipitation

Temperature and Precipitation

Halong Bay climate data provided by Weather2Travel.com
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Precipitation (mm) 18 36 39 71 159 203 292 323 321 90 38 18
Temperature (°C) 21 20 23 27 31 32 32 32 31 29 26 22
Sea Temperature (°C) 21 21 22 24 27 29 30 30 29 28 26 23

Daylight, Sunshine and UV

Daylight, Sunshine and UV

Halong Bay sunshine data provided by Weather2Travel.com
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Sunshine hours 3 2 3 4 6 6 7 6 6 6 5 5
Daylight hours 11.0 11.5 12.0 12.6 13.1 13.4 13.2 12.8 12.2 11.7 11.2 10.9
UV Index 8 10 12 12 12 12 12 12 11 10 8 7

UV Index and what it means

The ultraviolet index is a measure of the risk of skin damage due to exposure to the sun. Be aware that the potential damage caused by the sun varies from person to person as well as by time of day, altitude and several other factors. We recommend contacting your GP for further advice.

0-2 Wear sunglasses on bright days; use sunscreen if there is snow on the ground (which reflects UV radiation) or if you have particularly fair skin.
3-5 Wear sunglasses and use sunscreen, cover the body with clothing and a hat, and seek shade around midday when the sun is most intense.
6-7 Wear sunglasses and use sunscreen having SPF 15 or higher, cover the body with sun protective clothing and a wide-brim hat, and reduce time in the sun from two hours before to three hours after solar noon.
8-10 Wear sunscreen, a shirt, sunglasses and a hat. Do not stay out in the sun for too long.
11+
Take all precautions, including: wear sunglasses and use sunscreen, cover the body with a long-sleeved shirt and trousers, wear a very broad hat, and avoid the sun from two hours before to three hours after solar noon.
Climate data provided by Weather2Travel.com

Weather and 5 days Forecast

5 Day Forecast

Updated: Jul 30, 2014, 11:25am Local Time

Today Jul 30

Scattered T-Storms

86°F

77°F

Scattered T-Storms

Thu Jul 31

Mostly Sunny

88°

78°

Mostly Sunny

Fri Aug 1

Mostly Sunny

89°

79°

Mostly Sunny

Sat Aug 2

Scattered T-Storms

89°

79°

Scattered T-Storms

Sun Aug 3

Scattered T-Storms

90°

80°

Scattered T-Storms

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