Halong Bay weather
Current conditions
Averages and extremes
Yesterday's Data
Overview of Halong Bay weather
Halong Bay features a tropical monsoon climate characterized by two primary seasons: the hot and rainy season from May to October and the cool, dry season from November to April. During the hot season, temperatures can soar up to 36°C (97°F), accompanied by high humidity and frequent rain showers. In contrast, the cool season sees average temperatures of around 19°C (66°F) with significantly less rainfall. The optimal time to explore Halong Bay is from October to April, when the weather is generally pleasant and visibility is ideal for appreciating the stunning landscapes.
Halong Bay in Fall & Spring (September to November and March to May)
- Lowest temperature: 12ºC
- Highest temperature: 31ºC
- Humidity: 78%-84%
Choosing the best time for your visit will hinge on personal preferences. Many travelers favor the cool, dry conditions found in Spring and Fall, leading to peak visitation periods from March to April and September to October. During these months, visitors can anticipate plenty of sunny days, refreshing breezes, and stable weather. Occasional showers may occur, but they rarely disrupt planned activities.
Halong Bay in Summer (May-September)
- Lowest temperature: 22ºC
- Highest temperature: 39ºC
- Humidity: 82%
Summer extends from May through September, bringing hot and humid conditions. This weather can create breathtaking sunsets, visible on evenings when skies are clear of rain or fog. However, from July to September, expect increased rainfall as these months are the wettest, so travelers should monitor forecasts for potential severe weather. The peak temperatures during this period can reach up to 39°C (102°F).
Halong Bay in Winter (November to March)
- Lowest temperature: 9ºC
- Highest temperature: 18ºC
- Humidity: 80%
Winter spans from November to March, heralding the coldest months with average temperatures ranging from 9°C to 18°C (48°F to 64°F). The period is recognized as the dry season, offering minimal rainfall, making it a good time for peaceful explorations of the bay.
Owing to its geography as a closed-sea area, Halong Bay is fortunate to experience relatively few heavy storms. The strongest storms that affect the bay typically reach levels 9 and 10 on the severity scale, with seldom occurrences of storms reaching level 11.
Weather averages by month
| Month | High / Low (°C) | Rain |
|---|---|---|
| January | 20° / 14° | 4 days |
| February | 21° / 15° | 4 days |
| March | 23° / 18° | 7 days |
| April | 27° / 21° | 6 days |
| May | 30° / 24° | 8 days |
| June | 32° / 26° | 9 days |
| July | 32° / 26° | 11 days |
| August | 32° / 25° | 12 days |
| September | 31° / 24° | 10 days |
| October | 29° / 22° | 4 days |
| November | 26° / 19° | 3 days |
| December | 22° / 15° | 3 days |
Halong bay in January
Halong bay in February
Halong bay in March
Halong bay in April
Halong bay in May
Halong bay in June
Halong bay in July
Halong bay in August
Halong bay in September
Halong bay in October
Halong bay in November
Halong bay in December
Frequently asked questions
1. Which month is the hottest in Halong Bay?
June 2025 remains the hottest month in Halong Bay, where visitors can anticipate temperatures reaching or exceeding 30°C (86°F). This warm weather, combined with the area's stunning scenery, makes it a popular time for tourists. Remember to stay hydrated and explore the unique attractions Halong Bay has to offer during this vibrant season.
2. When is the coldest month in Halong bay?
January and February are the coldest months in Halong Bay. The average daily temperature in January and February ranges from 12°C-20°C (54°F-68°F), making it essential for visitors to dress warmly. The unique climate offers opportunities for different experiences, including serene boat tours amidst the bay's iconic limestone formations.
3. When does it often rain in Halong Bay?
The majority of rainfall now occurs in the summer (over 85%), particularly peaking in July and August in recent years. Winter precipitation has remained low, generally between 150 and 400 mm, but patterns are shifting due to climate change, leading to less predictability in weather patterns.
