Halong Bay in December: Crisp Days and Festive Cruises
As November’s cool days roll into December, the weather gets even crisper and the festive season kicks in; and it's definitely the prime time for international tourists. The weather is just perfect for cruising, and if you’re there for the holidays, the whole bay has a really special, festive vibe. Most of the cruise ships go all out for Christmas and New Year's, with big dinners, fun decorations, and entertainment.

A soft winter haze settles over Halong Bay as boats drift peacefully among the islets.
Photo: Mon Cheri Cruise
1. What is the Halong Bay weather in December?

Halong Bay in December has pretty much perfect "sweater weather". Average temperatures are somewhere from 16°C to 22°C, with crisp air, especially in the mornings and at night. You get a lot of clear, sunny days, and there's almost no rain to worry about. Sometimes a little mist will roll across the water around sunrise, which makes the whole landscape look absolutely magical. Just know that swimming is off the table. It's definitely too cold for a swim, but the incredible scenery more than makes up for it.
2. Pros and Cons
December has a lot going for it. The days are just gorgeous - sunny, cool, and dry, which is perfect for being out on the deck or trying some kayaking. You can be outside for ages and not feel all sticky and gross because the humidity is so low, and you pretty much don't have to worry about rain ruining your trip. For a lot of us, it's a really pleasant kind of winter, a nice escape from either freezing-cold weather back home or the intense tropical heat elsewhere in Southeast Asia.
That said, December isn’t the best month for swimming. If you're traveling with kids or older relatives, they might find it a bit too brisk, especially in the morning and at night on the water. Also, don't be fooled by the "low season" talk - that's just for local tourists. It's actually peak time for international travelers, so cruises can fill up fast. For trips over Christmas or New Year’s Eve, they almost always tack on a holiday fee of anywhere from $30 to $70 for special dinners and things.
3. What to Pack for Halong Bay in December?
So, what should you actually pack? A warm jacket or a good sweater is an absolute must for the mornings and evenings, it gets colder on the water than you’d think. You’d even throw in a scarf or a beanie if you plan on stargazing from the deck at night. And don't let the cool air fool you; the sun can still be pretty strong, so definitely bring sunscreen.
For getting around, all you really need are some comfy sneakers, long-sleeved shirts, and your camera, of course. And if you happen to be there over the holidays, maybe pack one slightly nicer outfit for dinner. It doesn't need to be fancy, just something a bit festive.
4. Tips & Planning Guide
A couple of tips for anyone traveling in December: if you're even thinking about going around Christmas or New Year's, you need to book early. The best cruises get snapped up weeks in advance, and prices will only go up. Make sure you check what's included in your holiday package, as some will tack on an extra fee for the big gala dinner. And one last thing: a cabin with heating is a game-changer, especially if you get cold easily or you're traveling with family.
Halong Bay in December has this quiet, peaceful charm. It’s not your typical beach vacation where you’re swimming all day. Instead, it’s the perfect time to just relax and soak in the incredible scenery without the massive crowds and sticky heat. Just pack smart, plan ahead, and get ready to see the cool, sunny side of Halong Bay.