October in Halong Bay: Weather and Event Guide

October is one of the best months to visit Halong Bay for the amiable weather.

October in Halong Bay: Weather and Event Guide

  • October marks the end of summer, expect sunshine and a fresh, cool breeze.
  • Because the weather is quite comfortable, therefore it’s a great time to explore some caves and visit some of the floating villages.
  • It’s still off-peak season so there’s still time to get some discounts.

October Weather in Halong Bay

Even though October is not as suffocatingly hot as in the height of summer, with an average of 27°C it’s still nice and warm. As the temperature drops, a light cool breeze makes its way into Halong Bay allowing for comfortable cruising conditions. During October, we have nearly 12 hours of daylight between sunrise and sunset with 7 hours of effective sunlight. The humidity is around 70%, in combination with gentle temperatures and an easy breeze, the weather is quite agreeable. Even though the temperature has not dropped that much, we see much less rainfall. Where we still had 190mm of rain over 14 days in September, that number goes down to around 50-58mm of rain over 10-12 days in October.

MonthHigh / Low (°C)Average rainfall (MM)Rain Days
October31° / 24°50-58mm10-12 days

October Weather Averages

Pros and Cons of Visiting in October


  • The weather in October is nice and warm but not as humid as in the previous months. There’s a lot less rainfall than in September.
  • Large crowds can be avoided as we’re still not in peak season. 


  • There’s a slight chance you might experience the Northeast monsoon towards to end of the month, but Northeast monsoons are not nearly as wet as the Southwest monsoons we have during the rainy seasons. 
  • Temperatures can drop a bit as it’s edging towards November.


There are no public holidays or festivals in October.

What to pack

With the sea temperature still being a comfortable 27°C, in October it’s still quite nice to go for a swim or do some snorkeling. Pack your swimming gear to make sure you don’t miss any good opportunities. The sun can still be quite strong, so bringing some sunscreen is recommended. You should pack a sweater as it can be quite chilly towards the end of the month or when a rainstorm hits. Besides that, some light summer clothing should suffice.


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