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

Thu 30 Sep
33°C 30°C Sunny skies
6 m/h
clouds: 2%, 1008 hpa
Fri 01 Oct
32°C 30°C Sunny skies
9 m/h
clouds: 3%, 1008 hpa
Sat 02 Oct
32°C 30°C Sunny skies
7 m/h
clouds: 13%, 1009 hpa
Sun 03 Oct
31°C 28°C Light rain shower
7 m/h
clouds: 51%, 1010 hpa
Mon 04 Oct
31°C 28°C Sunny skies
11 m/h
clouds: 9%, 1011 hpa
Tue 05 Oct
28°C 26°C Moderate or heavy rain shower
14 m/h
clouds: 100%, 1012 hpa
Wed 06 Oct
32°C 30°C Sunny skies
6 m/h
clouds: 22%, 1009 hpa
Wed 06 Oct
32°C 30°C Sunny skies
6 m/h
clouds: 22%, 1009 hpa
Thu 07 Oct
32°C 30°C Patchy rain possible
5 m/h
clouds: 18%, 1006 hpa
Fri 08 Oct
32°C 30°C Sunny skies
6 m/h
clouds: 8%, 1006 hpa
Sat 09 Oct
29°C 26°C Patchy rain possible
22 m/h
clouds: 47%, 1006 hpa
Sun 10 Oct
27°C 24°C Patchy rain possible
21 m/h
clouds: 27%, 1007 hpa
Mon 11 Oct
24°C 21°C Light drizzle
12 m/h
clouds: 76%, 1009 hpa
Tue 12 Oct
24°C 21°C Cloudy skies
9 m/h
clouds: 80%, 1011 hpa
Wed 13 Oct
30°C 27°C Sunny skies
13 m/h
clouds: 5%, 1012 hpa
Thu 14 Oct
32°C 30°C Sunny skies
3 m/h
clouds: 0%, 1011 hpa
Fri 15 Oct
26°C 23°C Partly cloudy skies
9 m/h
clouds: 45%, 1011 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!