Weather in Halong bay: Climate, Seasons, and Average Monthly Temperature.

Halong Bay Weather

  • Monsoon Influence: Halong Bay is influenced by the monsoon climate; which brings heavy rain and high humidity in the summer months.
  • Cooler Winters: Winter temperatures in Halong Bay can drop to as low as 10°C, making it a refreshing change from the hot and humid summers.
  • Foggy Conditions: Halong Bay can be prone to foggy conditions, particularly in the winter months; adding to the ethereal beauty of the bay.
  • Rainy Season: The rainy season in Halong Bay can bring heavy downpours, but these also help to maintain the lush vegetation and keep the bay thriving.
  • Tropical Storms: Halong Bay is vulnerable to tropical storms, which can bring strong winds and heavy rain; It's important to check the weather forecast before visiting the bay during the storm season.
  • 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 monsoon climate with two main seasons: the hot and rainy season from May to October and the cool and dry season from November to April. During the hot season, temperatures can reach up to 35°C with high humidity and frequent rain showers, while during the cool season temperatures average around 20°C with less rainfall. Overall, the best time to visit Halong Bay is from October to April when the weather is pleasant and the visibility is better for viewing the scenic landscape.

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 01 Jun
33°C 30°C Clear skies
8 m/h
clouds: 7%, 1000 hpa
Fri 02 Jun
33°C 31°C Sunny skies
9 m/h
clouds: 5%, 1003 hpa
Sat 03 Jun
34°C 31°C Sunny skies
9 m/h
clouds: 7%, 1004 hpa
Sun 04 Jun
34°C 31°C Sunny skies
11 m/h
clouds: 12%, 1005 hpa
Mon 05 Jun
33°C 30°C Partly cloudy skies
11 m/h
clouds: 35%, 1005 hpa
Tue 06 Jun
33°C 30°C Patchy rain possible
11 m/h
clouds: 31%, 1005 hpa
Wed 07 Jun
32°C 30°C Sunny skies
11 m/h
clouds: 11%, 1004 hpa
Wed 07 Jun
32°C 30°C Sunny skies
11 m/h
clouds: 11%, 1004 hpa
Thu 08 Jun
32°C 29°C Partly cloudy skies
8 m/h
clouds: 25%, 1004 hpa
Fri 09 Jun
31°C 28°C Thundery outbreaks possible
12 m/h
clouds: 29%, 1004 hpa
Sat 10 Jun
33°C 31°C Moderate or heavy rain shower
6 m/h
clouds: 31%, 995 hpa
Sun 11 Jun
34°C 31°C Patchy rain possible
7 m/h
clouds: 19%, 997 hpa
Mon 12 Jun
33°C 31°C Sunny skies
11 m/h
clouds: 18%, 1000 hpa
Tue 13 Jun
33°C 30°C Patchy light rain with thunder
9 m/h
clouds: 17%, 1001 hpa
Wed 14 Jun
32°C 29°C Light rain shower
6 m/h
clouds: 58%, 1000 hpa
Thu 15 Jun
31°C 28°C Torrential rain shower
16 m/h
clouds: 100%, 1000 hpa
Fri 16 Jun
31°C 28°C Moderate or heavy rain shower
6 m/h
clouds: 47%, 1000 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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