Halong Bay Weather: Climate, Seasons, and Average Temperature

December 05, 2023

Halong Bay is a famous World Natural Heritage region of Vietnam, that captivates visitors with its stunning landscape. As part of the Gulf of Tonkin, the weather in Ha Long Bay has four distinct seasons. Each of them has a certain impact on the landscape, giving you different experiences. Don't miss the chance to discover the allure of Halong Bay at any time.

Halong Bay Weather: Climate, Seasons, and Average Temperature

Halong Bay’s Climate

  • Climate: Tropical monsoon climate.
  • Average temperature: 23.7 °C.
  • Average rainfall: 1832 mm.
  • Humidity: 84%.

Situated in the northern region of Vietnam, Halong Bay boasts a typical tropical monsoon climate characterized by four distinct seasons, rendering it an appealing destination throughout the year.

The tropical monsoon climate has outstanding characteristics with clear changes between seasons of the year. The weather can become hot and humid from May to August, with peak temperatures around 37°C - 38°C usually seen in June. This is also called the wet season, the highest rainfall is in July and August with an average of 350mm.

The cold period, on the other hand, often brings cooler and drier air. The lowest temperature is approximately 13°C - 14°C usually occurs in January. During this period, the rainfall is low and fog may appear in the morning.


Average Temperature & Rainfall

Below are average data for more than 2 decades in Halong for your reference about the temperature and rainfall in Halong:


Average High/Low (°C)




43 mm



35 mm



56 mm



82 mm



233 mm



290 mm



323 mm



382 mm



250 mm



106 mm



60 mm



34 mm


Seasons in Halong Bay


  • Months: Feb - Apr
  • Temperature: 15°C - 30°C
  • Humidity level: 68 - 75%

Spring comes bringing warm sunshine to everything around. The temperature will gradually increase, bringing comfort and warmth. The weather at this time is pretty mild, not as cold as the winter. However, between February and March, there will be scattered raindrops for many days. It is a characteristic that only spring in Northern Vietnam has.

Overall, it's an ideal time for boat cruises, hiking, and exploring local fishing villages, surrounded by lush greenery and colorful blossoms.

Halong Bay in Spring

The pretty Halong Bay in Spring


  • Months: May - Aug
  • Temperature: 26°C - 38°C
  • Humidity level: 75 - 78%

As Spring comes and goes, Halong Bay officially enters the summer, the hottest season. At the beginning of summer, there are refreshing cool breezes, making the conditions quite pleasant compared to the dampness of spring. The temperatures only soar significantly around June to July, with scorching heat, intense sunlight, and humid atmosphere. Halong at the end of summer also comes with an erratic climate, often with sudden heavy rains and even storms.

This is the perfect period for water-related activities, including swimming, kayaking, and sunbathing. The extended summer days also offer a chance to witness the most awe-inspiring sunrises and sunsets.

Summer in Halong Bay

Bright sunlight suitable for Sea-related activities


  • Months: Sep - Nov
  • Temperature: 19°C - 33°C
  • Humidity level: 70 - 72%

Fall is considered the most romantic season of the year and is also the most beautiful time for tourists to visit Halong. The weather is pleasant with less rainfall than summer, not too hot nor too cold, and mild sunshine. Halong's weather in October and November is usually cool. Visitors will feel the gentle breeze and see extremely poetic scenes.

Autumn in Halong Bay is ideal for cruising, diving, and kayaking, with the tranquil waters and crisp air creating a perfect setting for unforgettable experiences.

Halong Bay's Fall

The charming scenery of Halong Bay's Fall


  • Months: Dec - Jan
  • Temperature: 12°C - 23°C
  • Humidity level: 65 - 69%

Winter is when the climate becomes harsh with temperatures often dropping very low and less rainfall. In winter, Halong Bay takes on a quieter charm, accompanied by fog that adds a mysterious touch to the surrounding scenery. Fog covers the limestone mountains, giving them an ethereal look, and offering a unique perspective.

This season becomes a suitable time for cave exploration, visits to traditional fishing villages, and savoring fresh seafood dishes. 

Halong Bay in Winter

Winter brings a mysterious charm to Halong


The best time to visit Halong Bay

You can visit Ha Long Bay all year round as this location offers different experiences depending on the season. However, Fall is the best time overall to visit Halong Bay because the weather is nice, mild, and pleasant. There are often gentle winds and cool air bringing a nice feeling for visitors to explore and enjoy the beauty of Halong.

The best time to visit Halong Bay

Oct - Nov is the best time to visit Halong Bay

However, Halong Bay offers other opportune moments for different preferences, too:

  • For nice weather: February - April 

With low humidity, and clear skies, these months provide ideal weather. Visitors can enjoy the beauty of Halong Bay comfortably, enhancing your overall experience.

  • For the best deal: May - September

Recognized as the low season for inbound tourists, this period often presents promotions and discounts on tours and accommodations. We offer budget-friendly options, making it an economical choice for visitors seeking cost-effective opportunities.


Halong is a destination that caters to every taste, no matter what season. Whether you seek adventure or relaxation, this place is guaranteed to create memories that will last a lifetime. Unlock the magic of Halong Bay's scenic beauty by booking an amazing tour on Halong Bay Junk Boat now!

Meadow Pham

Image source: Internet

Plan your tailor - made trip with a local expert
Book securely with money-back guarantee
Travel stress-free with local 24/7 support
Ask a Question