Things to Do in Halong in December
December weather, activities, events & insider tips
December Weather in Halong
Is December Right for You?
Advantages
- December sits in the sweet spot between the tail-end of autumn and the start of proper winter - the limestone karsts still glow that copper-green from the last rains, but the sea has calmed enough that boat operators stop canceling trips every other day
- Hotel rates along Bai Chay Beach drop 30-40% from October peaks while the waterfront bars keep their December-only happy hour extensions (5-7pm becomes 5-8pm) because management knows occupancy is thin
- The squid boats start running night tours again - you’ll see the green phosphorescent lamps strung out across the bay like a low constellation, something that disappears January-February when the squid migrate deeper
- Local families dominate the weekend markets rather than tour groups - you’ll hear Vietnamese being spoken at Dong Trieu ceramics market instead of German, Russian, and the occasional Australian drawl
Considerations
- The humidity hovers around 70% and feels higher when you’re on the water - your camera lens will fog every time you step from air-conditioned boat cabin to deck, and that lightweight jacket you packed will stick to your arms by 10am
- December weather tends to be variable in the literal sense - you might get three perfect blue-sky days followed by a low-pressure system that strands boats at Tuan Chau Marina for 48 hours, and meteorologists here still predict by reading cloud patterns over Cat Ba Island
- Some of the floating villages shut down for maintenance - the oyster farms near Vung Vieng pull their nets in December, so you’re seeing working life rather than working life, if that distinction matters to you
Best Activities in December
Lan Ha Bay kayaking circuits
December’s flat water and thin crowds mean you can paddle the 1.5 km (0.9 mile) tunnel cave at Dark & Bright Lagoon without a flotilla of other kayaks photobombing every shot. The limestone arches are still dripping from November rains, so you get that echo-y drip sound bouncing off the walls that disappears in dry season. Morning sessions start at 8am when the water’s glassy and the tide’s low enough to slip through sea caves you can’t enter at noon.
Halong Bay squid fishing night cruises
The squid season peaks December through February - you’ll see dozens of wooden junks with green LED lamps scattered across the bay, each lamp attracting clouds of squid that shoot ink clouds when hauled aboard. The air smells distinctly metallic, like pennies and seaweed, and the boat engines idle at that low rumble that vibrates through the hull plating. Most tours include a hotpot on deck using whatever you catch - the squid turns white in 30 seconds in the boiling broth.
Hospital Cave tours (Cat Ba Island)
December’s 70% humidity makes the underground hospital feel like it did when VC soldiers occupied it - the air gets thick and medicinal, in the operating room where limestone walls weep condensation. The 17-level complex stays a constant 22°C (72°F) year-round, so December visitors linger longer than summer tourists fleeing back to AC vans. Bring a flashlight - the generator lighting fails at least once daily and you’ll be standing in pitch black 20 meters (65 feet) inside a mountain.
Dong Trieu ceramic village workshops
December is when kilns fire continuously for Tet orders - the whole village smells like woodsmoke and wet clay, and you’ll see artisans applying dragon motifs to 200-liter rice wine jars that take three weeks to finish. The pottery wheels spin slower in winter; clay stays workable longer, so you can try throwing a pot without it collapsing in the humidity. Morning sessions start at 8:30am when the kilns are being opened - the ceramic ping sound as pieces cool is oddly satisfying.
Bai Tu Long Bay multi-day junk charters
December’s thin boat traffic means captains anchor at Con Co Island instead of the usual tourist coves - you’ll wake to sunrise over the lighthouse with zero other boats in sight, and the only sounds are diesel generators winding down and the slap of water against steel hulls. The water’s too cold for swimming but perfect for floating breakfast trays on bamboo rafts while limestone cliffs turn gold behind you. Night temperatures drop to 18°C (64°F) on deck, so the crew breaks out thick wool blankets that smell faintly of diesel and star anise.