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

Mon 20 Sep
31°C 28°C Patchy rain possible
10 m/h
clouds: 21%, 1009 hpa
Tue 21 Sep
32°C 30°C Sunny skies
8 m/h
clouds: 6%, 1008 hpa
Wed 22 Sep
32°C 29°C Light rain shower
10 m/h
clouds: 44%, 1008 hpa
Thu 23 Sep
32°C 29°C Light rain shower
9 m/h
clouds: 51%, 1010 hpa
Fri 24 Sep
31°C 28°C Light rain shower
10 m/h
clouds: 65%, 1011 hpa
Sat 25 Sep
32°C 30°C Light rain shower
9 m/h
clouds: 37%, 1011 hpa
Sun 26 Sep
31°C 28°C Moderate or heavy rain shower
12 m/h
clouds: 61%, 1010 hpa
Sun 26 Sep
31°C 28°C Moderate or heavy rain shower
12 m/h
clouds: 61%, 1010 hpa
Mon 27 Sep
31°C 28°C Moderate or heavy rain shower
12 m/h
clouds: 30%, 1011 hpa
Tue 28 Sep
30°C 27°C Moderate or heavy rain shower
9 m/h
clouds: 54%, 1010 hpa
Wed 29 Sep
32°C 29°C Moderate or heavy rain shower
9 m/h
clouds: 28%, 1010 hpa
Thu 30 Sep
33°C 31°C Patchy rain possible
13 m/h
clouds: 23%, 1007 hpa
Fri 01 Oct
28°C 25°C Heavy rain
26 m/h
clouds: 79%, 1007 hpa
Sat 02 Oct
27°C 24°C Heavy rain
31 m/h
clouds: 100%, 1005 hpa
Sun 03 Oct
27°C 25°C Moderate rain
17 m/h
clouds: 100%, 1010 hpa
Mon 04 Oct
27°C 25°C Patchy rain possible
11 m/h
clouds: 37%, 1010 hpa
Tue 05 Oct
30°C 27°C Moderate or heavy rain shower
7 m/h
clouds: 47%, 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

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