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.

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 38°C.


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 23 Nov
26°C 25°C Patchy rain possible
18 m/h
clouds: 32%, 1019 hpa
Tue 24 Nov
26°C 24°C Light rain shower
15 m/h
clouds: 100%, 1019 hpa
Wed 25 Nov
26°C 25°C Light rain shower
12 m/h
clouds: 83%, 1017 hpa
Thu 26 Nov
26°C 25°C Light rain shower
14 m/h
clouds: 56%, 1019 hpa
Fri 27 Nov
25°C 23°C Cloudy skies
17 m/h
clouds: 85%, 1022 hpa
Sat 28 Nov
25°C 23°C Patchy rain possible
16 m/h
clouds: 39%, 1022 hpa
Sun 29 Nov
21°C 21°C Light rain shower
22 m/h
clouds: 100%, 1023 hpa
Sun 29 Nov
21°C 21°C Light rain shower
22 m/h
clouds: 100%, 1023 hpa
Mon 30 Nov
18°C 18°C Cloudy skies
16 m/h
clouds: 66%, 1023 hpa
Tue 01 Dec
17°C 17°C Partly cloudy skies
9 m/h
clouds: 47%, 1026 hpa
Wed 02 Dec
15°C 15°C Overcast skies
8 m/h
clouds: 99%, 1024 hpa
Thu 03 Dec
17°C 17°C Partly cloudy skies
7 m/h
clouds: 34%, 1021 hpa
Fri 04 Dec
20°C 20°C Partly cloudy skies
5 m/h
clouds: 25%, 1019 hpa
Sat 05 Dec
19°C 19°C Partly cloudy skies
13 m/h
clouds: 28%, 1020 hpa
Sun 06 Dec
17°C 17°C Clear skies
15 m/h
clouds: 13%, 1022 hpa
Mon 07 Dec
16°C 16°C Clear skies
14 m/h
clouds: 11%, 1022 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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