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

Tue 17 Sep
35°C 32°C Partly cloudy skies
4 m/h
clouds: 45%, 1008 hpa
Wed 18 Sep
32°C 29°C Patchy rain possible
14 m/h
clouds: 24%, 1010 hpa
Thu 19 Sep
31°C 29°C Moderate or heavy rain shower
13 m/h
clouds: 69%, 1011 hpa
Fri 20 Sep
32°C 31°C Sunny skies
11 m/h
clouds: 8%, 1009 hpa
Sat 21 Sep
31°C 30°C Partly cloudy skies
7 m/h
clouds: 32%, 1011 hpa
Sun 22 Sep
30°C 27°C Sunny skies
15 m/h
clouds: 17%, 1015 hpa
Mon 23 Sep
30°C 28°C Sunny skies
14 m/h
clouds: 17%, 1016 hpa
Mon 23 Sep
30°C 28°C Sunny skies
14 m/h
clouds: 17%, 1016 hpa
Tue 24 Sep
31°C 28°C Partly cloudy skies
3 m/h
clouds: 25%, 1015 hpa
Wed 25 Sep
30°C 26°C Sunny skies
11 m/h
clouds: 9%, 1015 hpa
Thu 26 Sep
31°C 27°C Sunny skies
12 m/h
clouds: 24%, 1014 hpa
Fri 27 Sep
28°C 26°C Cloudy skies
11 m/h
clouds: 77%, 1013 hpa
Sat 28 Sep
31°C 29°C Sunny skies
7 m/h
clouds: 22%, 1011 hpa
Sun 29 Sep
32°C 29°C Partly cloudy skies
6 m/h
clouds: 40%, 1010 hpa
Mon 30 Sep
31°C 28°C Torrential rain shower
13 m/h
clouds: 47%, 1007 hpa
Tue 01 Oct
30°C 27°C Heavy rain
15 m/h
clouds: 81%, 1007 hpa
Wed 02 Oct
30°C 27°C Moderate or heavy rain shower
15 m/h
clouds: 84%, 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

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