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

Sat 14 Oct
30°C 27°C Partly cloudy skies
14 m/h
clouds: 30%, 1012 hpa
Sun 15 Oct
29°C 26°C Sunny skies
9 m/h
clouds: 20%, 1012 hpa
Mon 16 Oct
30°C 27°C Partly cloudy skies
12 m/h
clouds: 26%, 1012 hpa
Tue 17 Oct
30°C 27°C Partly cloudy skies
14 m/h
clouds: 60%, 1012 hpa
Wed 18 Oct
27°C 25°C Light rain
13 m/h
clouds: 100%, 1009 hpa
Thu 19 Oct
31°C 28°C Partly cloudy skies
4 m/h
clouds: 41%, 1009 hpa
Fri 20 Oct
28°C 26°C Light rain shower
9 m/h
clouds: 78%, 1012 hpa
Fri 20 Oct
28°C 26°C Light rain shower
9 m/h
clouds: 78%, 1012 hpa
Sat 21 Oct
23°C 21°C Overcast skies
8 m/h
clouds: 100%, 1016 hpa
Sun 22 Oct
22°C 19°C Overcast skies
9 m/h
clouds: 100%, 1018 hpa
Mon 23 Oct
24°C 21°C Light rain shower
14 m/h
clouds: 100%, 1017 hpa
Tue 24 Oct
26°C 23°C Moderate or heavy rain shower
12 m/h
clouds: 81%, 1016 hpa
Wed 25 Oct
27°C 25°C Light rain shower
11 m/h
clouds: 51%, 1014 hpa
Thu 26 Oct
28°C 26°C Patchy rain possible
10 m/h
clouds: 20%, 1012 hpa
Fri 27 Oct
29°C 26°C Patchy rain possible
6 m/h
clouds: 17%, 1010 hpa
Sat 28 Oct
28°C 26°C Patchy rain possible
8 m/h
clouds: 35%, 1010 hpa
Sun 29 Oct
30°C 27°C Patchy rain possible
6 m/h
clouds: 22%, 1009 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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