Weather in Halong bay: Climate, Seasons, and Average Monthly Temperature.

Halong Bay Weather

  • Wet season: May to September.
  • Dry season: November to March.
  • Best times to visit: January to April, October to December.
  • Halong is one of the most humid cities in Vietnam with the average annual humidity at 84%, which fluctuate from a minimum of 68% to a maximum of 90% in a year.

Weather Overview

Halong Bay has a tropical hot climate, with two very different weather patterns: hot and wet in the summer months, and dry and cool in the winter. Temperatures typically vary from around 14°C - 32°C so it is relatively temperate all year round.

Spring & Fall

Deciding on the best time to visit will depend on your personal preferences. As many people prefer the cool, dry weather of Spring and Fall, the peak visiting times tend to be from March to April and September to October. During these months, you can expect more sunny days, a cooler breeze and calmer weather. A minor shower is to be expected occasionally, but they rarely last long enough to disrupt visitors' plans.


Summer lasts from around May to September, and in this time, the air is hot and humid. This warmer weather helps create beautiful sunsets, viewable at times when there is no rain or fog. While the promise of summer heat can be tempting, the months of July to September are also the wettest, so visitors should check weather forecasts for signs of severe weather. Temperature high for these months is 32 °C.


Winter lasts from around December to March. These months are the coldest with temperatures dropping down to 12 °C - 20 °C on average with a low of 16 °C. This is also the dry season, not a lot of rainfall is to be expected.

Halong bay on a sunny summer day. 

Thanks to the nature of a closed-sea area, Halong is lucky not to be much affected by heavy storms. The strongest storms on the bay normally are at level 9 and 10, hardly anytime reaching level 11.

14-Day Weather Forecast

Thu 28 May
32°C 29°C Sunny skies
7 m/h
clouds: 17%, 1008 hpa
Fri 29 May
32°C 28°C Partly cloudy skies
9 m/h
clouds: 31%, 1007 hpa
Sat 30 May
32°C 30°C Sunny skies
12 m/h
clouds: 14%, 1007 hpa
Sun 31 May
32°C 29°C Sunny skies
12 m/h
clouds: 19%, 1005 hpa
Mon 01 Jun
33°C 31°C Sunny skies
12 m/h
clouds: 14%, 1004 hpa
Tue 02 Jun
32°C 29°C Sunny skies
14 m/h
clouds: 12%, 1003 hpa
Wed 03 Jun
32°C 30°C Sunny skies
11 m/h
clouds: 9%, 1001 hpa
Wed 03 Jun
32°C 30°C Sunny skies
11 m/h
clouds: 9%, 1001 hpa
Thu 04 Jun
31°C 28°C Patchy rain possible
7 m/h
clouds: 29%, 1003 hpa
Fri 05 Jun
31°C 30°C Moderate or heavy rain shower
6 m/h
clouds: 58%, 1001 hpa
Sat 06 Jun
32°C 28°C Moderate or heavy rain shower
6 m/h
clouds: 25%, 1002 hpa
Sun 07 Jun
29°C 26°C Light rain shower
10 m/h
clouds: 39%, 1002 hpa
Mon 08 Jun
30°C 27°C Torrential rain shower
13 m/h
clouds: 54%, 1002 hpa
Tue 09 Jun
31°C 27°C Moderate or heavy rain shower
11 m/h
clouds: 40%, 1004 hpa
Wed 10 Jun
31°C 28°C Moderate or heavy rain shower
12 m/h
clouds: 23%, 1006 hpa
Thu 11 Jun
31°C 28°C Moderate or heavy rain shower
12 m/h
clouds: 16%, 1005 hpa
Fri 12 Jun
30°C 28°C Torrential rain shower
9 m/h
clouds: 33%, 1004 hpa

Monthly Weather Averages

High / Low (°C)
20° / 14°
4 days
21° / 15°
4 days
23° / 18°
7 days
27° / 21°
6 days
30° / 24°
8 days
32° / 26°
9 days
32° / 26°
11 days
32° / 25°
12 days
31° / 24°
10 days
29° / 22°
4 days
26° / 19°
3 days
22° / 15°
3 days

Weather By Month

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