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 23 Sep
33°C 30°C Sunny skies
9 m/h
clouds: 14%, 1009 hpa
Sun 24 Sep
32°C 30°C Patchy rain possible
14 m/h
clouds: 25%, 1008 hpa
Mon 25 Sep
32°C 30°C Sunny skies
17 m/h
clouds: 17%, 1007 hpa
Tue 26 Sep
32°C 30°C Sunny skies
15 m/h
clouds: 18%, 1008 hpa
Wed 27 Sep
33°C 31°C Patchy rain possible
6 m/h
clouds: 16%, 1007 hpa
Thu 28 Sep
33°C 31°C Light rain shower
16 m/h
clouds: 52%, 1006 hpa
Fri 29 Sep
34°C 31°C Light rain shower
17 m/h
clouds: 66%, 1004 hpa
Fri 29 Sep
34°C 31°C Light rain shower
17 m/h
clouds: 66%, 1004 hpa
Sat 30 Sep
31°C 28°C Sunny skies
10 m/h
clouds: 20%, 1010 hpa
Sun 01 Oct
29°C 26°C Overcast skies
47 m/h
clouds: 100%, 994 hpa
Mon 02 Oct
29°C 26°C Torrential rain shower
12 m/h
clouds: 93%, 1007 hpa
Tue 03 Oct
31°C 28°C Moderate or heavy rain shower
6 m/h
clouds: 30%, 1008 hpa
Wed 04 Oct
32°C 30°C Patchy rain possible
5 m/h
clouds: 16%, 1006 hpa
Thu 05 Oct
32°C 29°C Patchy rain possible
6 m/h
clouds: 16%, 1005 hpa
Fri 06 Oct
32°C 30°C Sunny skies
5 m/h
clouds: 5%, 1005 hpa
Sat 07 Oct
30°C 27°C Light rain shower
8 m/h
clouds: 61%, 1008 hpa
Sun 08 Oct
27°C 25°C Sunny skies
8 m/h
clouds: 23%, 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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