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 10°C - 38°C so it is relatively temperate all year round.

Halong Bay Weather in Fall & Spring (September to November and March to May)

  • Lowest temperature: 13ºC
  • Highest temperature: 32ºC
  • Humidity: 79%-85%

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.

Halong Bay Weather in Summer (May-September)

  • Lowest temperature: 21ºC
  • Highest temperature: 38ºC
  • Humidity: 81.5%

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 38°C.

Winter (November to March)

  • Lowest temperature: 10ºC
  • Highest temperature: 19ºC
  • Humidity: 79.2%

Winter lasts from around November to March. These months are the coldest with temperatures dropping down to 10°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

Wed 10 Aug
31°C 28°C Heavy rain at times
16 m/h
clouds: 46%, 998 hpa
Thu 11 Aug
27°C 24°C Moderate or heavy rain shower
25 m/h
clouds: 100%, 1000 hpa
Fri 12 Aug
30°C 27°C Moderate rain at times
8 m/h
clouds: 60%, 1004 hpa
Sat 13 Aug
31°C 28°C Partly cloudy skies
6 m/h
clouds: 29%, 1003 hpa
Sun 14 Aug
31°C 28°C Moderate or heavy rain shower
6 m/h
clouds: 63%, 1003 hpa
Mon 15 Aug
30°C 27°C Moderate or heavy rain shower
1 m/h
clouds: 89%, 1003 hpa
Tue 16 Aug
30°C 27°C Moderate or heavy rain shower
13 m/h
clouds: 83%, 1005 hpa
Tue 16 Aug
30°C 27°C Moderate or heavy rain shower
13 m/h
clouds: 83%, 1005 hpa
Wed 17 Aug
30°C 27°C Moderate rain
7 m/h
clouds: 83%, 1006 hpa
Thu 18 Aug
30°C 27°C Moderate or heavy rain shower
8 m/h
clouds: 48%, 1007 hpa
Fri 19 Aug
30°C 27°C Torrential rain shower
7 m/h
clouds: 74%, 1006 hpa
Sat 20 Aug
30°C 27°C Torrential rain shower
14 m/h
clouds: 17%, 1006 hpa
Sun 21 Aug
31°C 28°C Moderate or heavy rain shower
6 m/h
clouds: 13%, 1010 hpa
Mon 22 Aug
32°C 30°C Patchy rain possible
5 m/h
clouds: 15%, 1009 hpa
Tue 23 Aug
33°C 30°C Sunny skies
7 m/h
clouds: 5%, 1007 hpa
Wed 24 Aug
32°C 29°C Sunny skies
9 m/h
clouds: 6%, 1008 hpa
Thu 25 Aug
28°C 26°C Clear skies
7 m/h
clouds: 13%, 1008 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

Best Halong Bay Cruise Packages 2019

Explore Halong Bay

Discover the charming and exotic landscapes of Halong bay on an all-inclusive luxury cruise!