Discover the best time of year, based on historical climate, temperature, and precipitation.
The best weather in Ha Long is from January, November, December, but considering flight prices and crowds, the best months to visit are April, October, December. — predictable climate
🌦Humid
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Contains affiliate links.
Contains affiliate links.
| Score | 83 | 80 | 79 | 75 | 37 | 12 | 13 | 13 | 20 | 74 | 92 | 96 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Climate | Mild | Pleasant | Pleasant | Humid | Hot & rainy | Hot & rainy | Hot & rainy | Hot & rainy | Hot & rainy | Humid | Pleasant | Mild |
| Temperature | 14–20°C | 15–21°C | 19–24°C | 21–27°C | 25–30°C | 27–31°C | 27–31°C | 26–31°C | 25–30°C | 22–28°C | 20–26°C | 14–21°C |
| Feels like | 13–20°C | 15–22°C | 20–27°C | 24–31°C | 29–35°C | 33–38°C | 32–38°C | 32–38°C | 30–36°C | 23–31°C | 21–28°C | 13–21°C |
| Precipitation | 55mm 7 days | 59mm 7 days | 45mm 10 days | 92mm 12 days | 162mm 20 days | 244mm 23 days | 246mm 25 days | 406mm 26 days | 366mm 20 days | 142mm 11 days | 30mm 9 days | 10mm 6 days |
| Sunshine | 5.6h ☀︎ 50% | 4.6h ☀︎ 40% | 4.5h ☀︎ 37% | 6.5h ☀︎ 52% | 8.1h ☀︎ 61% | 5.8h ☀︎ 43% | 8.1h ☀︎ 61% | 5.8h ☀︎ 45% | 6.6h ☀︎ 54% | 8.3h ☀︎ 71% | 9.0h ☀︎ 80% | 6.7h ☀︎ 61% |
| Wind | E · 15 km/h | E · 16 km/h | E · 15 km/h | E · 16 km/h | SE · 16 km/h | SE · 16 km/h | SE · 16 km/h | SE · 13 km/h | E · 14 km/h | NE · 17 km/h | NE · 16 km/h | NE · 15 km/h |
| Humidity (%) | 76% | 82% | 86% | 84% | 84% | 83% | 84% | 86% | 85% | 73% | 73% | 65% |
| Perfect days | 35% | 46% | 55% | 38% | 6% | 0% | 0% | 0% | 2% | 22% | 56% | 50% |
| Dry streak | 16d | 13d | 9d | 7d | 5d | 4d | 4d | 3d | 5d | 10d | 13d | 15d |
| Sunny streak | 8d | 7d | 7d | 10d | 12d | 10d | 14d | 10d | 12d | 17d | 15d | 10d |
| Extreme heat | — | — | — | — | — | 1% | 1% | 0% | 0% | — | — | — |
| Temperature | +1.4° | +0.1° | +1.1° | +0.1° | +0.4° | +0.7° | +0.6° | +0.2° | +0.1° | -0.6° | +1.8° | +0.5° |
| Rainfall | Getting wetter | Getting wetter | Stable | Getting wetter | Getting drier | Getting drier | Stable | Much wetter | Much wetter | Getting wetter | Stable | Stable |
| Ideal warm days | 0% | 3% | 9% | 32% | 25% | 9% | 9% | 9% | 25% | 54% | 29% | 2% |
| Outdoor comfort | 45% | 50% | 46% | 16% | 1% | 0% | 0% | 0% | 0% | 8% | 41% | 55% |
| Dry week odds | 42% | 35% | 15% | 8% | 2% | 0% | 1% | 0% | 3% | 20% | 31% | 41% |
| Heavy rain | 1% | 1% | 1% | 2% | 8% | 14% | 16% | 17% | 13% | 4% | 1% | — |
| Muggy days | 1% | 11% | 35% | 69% | 93% | 99% | 100% | 100% | 93% | 61% | 33% | 7% |
| Oppressive days | — | — | — | 10% | 64% | 96% | 99% | 97% | 70% | 8% | 2% | — |
| Day length | 11.0h | 11.5h | 12.0h | 12.6h | 13.1h | 13.4h | 13.3h | 12.8h | 12.3h | 11.7h | 11.1h | 10.9h |
| Tourist Crowds | High season | High season | High season | Low season | Shoulder season | Low season | Low season | Shoulder season | Low season | Shoulder season | High season | High season |
This vibrant annual festival transforms Ha Long into a lively spectacle of parades, street performances, and cultural sh…
The most important holiday in Vietnam, Tet brings a festive atmosphere with family gatherings, temple visits, and specia…
This significant Buddhist pilgrimage festival takes place at Yen Tu Mountain, a short distance from Ha Long. Pilgrims an…
An international marathon event offering stunning views of Ha Long Bay as runners traverse the scenic routes along the c…
Every standard weather chart crowns December as Ha Long's finest hour, but the truth lives in April: when the Gulf of Tonkin warms enough for swimming, the coastal boulevard sheds its winter chill, and the bay trades cold stillness for exuberant life.
Nobody travels to Ha Long for the city itself. You come because two hours east of Hanoi, the earth dissolves into the sea, leaving thousands of sheer limestone pillars rising out of emerald water like submerged mountain ranges. The city of Ha Long—born from the union of industrial Hòn Gai and the shoreline strip of Bãi Cháy—exists almost entirely as a gangway to the bay. Yet how you experience this seascape depends entirely on which version of northern Vietnam's volatile climate you collide with. Conventional guides will steer you toward the crisp, dry perfection of late autumn and winter, but they miss the soul of the place. The real sweet spot belongs to the turn of spring, when the water turns swim-friendly, the town shakes off its fog, and the maritime frontier comes roaring alive.
April is the linchpin of the Ha Long calendar. A meteorological reading will tell you that December is clearer and drier, but December gives you a bay you look at through a fleece jacket while huddled on an upper deck. April gives you a bay you can actually enter. The sea loses its bite, the midday heat creeps toward thirty degrees, and the towering karst pillars emerge from their winter cocoon into soft sunlight.
Because the city registers this transition as low season on international rosters despite heavy domestic footfall, you enter a vibrant hybrid world. Along the waterfront promenade of Bãi Cháy, the streets fill with energy during the Ha Long Carnival Festival, when brass bands, street dancers, and costumed performers parade along the shoreline against a backdrop of limestone silhouettes. The domestic crowds arrive in force, yet the mood is intoxicatingly celebratory rather than stifling.
By May, humidity climbs noticeably and afternoon squalls become more frequent, but the bay remains wide open. Kayaking through tidal caves into silent hidden lagoons requires warm skin and water that welcomes your hands; April and early May deliver precisely that, making the trade against December's colder, drier perfection an easy victory.
Summer in Ha Long is an all-or-nothing gamble that most travelers lose. From June through August, apparent temperatures routinely hover near forty degrees, and the air sits over the water like hot wool. When the sun shines, the limestone cliffs look extraordinarily sharp against brilliant turquoise water, but staying exposed on a wooden boat deck feels like baking under glass.
The real threat is the rain. The monsoon gathers momentum through midsummer and peaks in August and September, unleashing sudden, violent downpours that shut down harbor operations on short notice. Maritime authorities strictly forbid overnight boats from leaving the docks when squalls blow in from the Gulf of Tonkin. Spending three days marooned in a dockside hotel room while rain lashes the windows of Bãi Cháy is a common summer heartbreak.
If you must visit during these months, keep your itinerary loose and prepare for sticky, sweltering afternoons where the only respite is diving off the stern of a boat into sun-warmed water. Watch the harbor flags; when the storm warnings go up, the bay becomes completely off-limits.
In October, the monsoon breaks. The drenching cloudbursts clear out, leaving behind washed-clean air, sharp horizons, and water that still holds a trace of summer warmth. For pure cruising conditions, November is practically peerless: steady sunshine, cool breezes off the water, and negligible rain.
This is when runners take over the shoreline for the Ha Long Bay Heritage Marathon, tracing the coast between Hòn Gai and the bay's dramatic karst backdrop under crisp morning skies. You can sit on an open top deck from dawn to dusk without sweating through your clothes or shivering behind a windbreaker.
The trade-off is an influx of international travelers and a distinct drop in sea temperature toward the end of November. Kayaking is sublime, but long swims become an exercise in endurance. It lacks the festive local buzz of April, replacing it with an orderly, serene cruise culture that appeals to anyone who prefers calm vistas to bustling harbor towns.
Winter casts a brooding, cinematic spell over the bay that divides opinion completely. December offers the driest conditions of the entire year, with skies that rarely spill a drop, but the apparent temperature drops into the low teens. The limestone monoliths don't gleam under tropical light; they loom out of grey sea fog like brushstrokes in an ink-wash painting.
By January and February, a perpetual drizzle known as *mưa phùn* settles over northern Vietnam. It is not heavy enough to cancel boat departures, but it blankets the horizon in ghostly white. The water is far too chilly for swimming, and evenings on the open bay require thermal layers. Yet this ethereal atmosphere has its own quiet magic, stripped of resort glitz and beach crowds.
Cultural rhythms peak during this window. Around Tet Nguyen Dan, the Vietnamese Lunar New Year, the streets of Hòn Gai quiet down as families gather, though transport links can clog with holiday travelers. Just inland, pilgrims begin ascending Yen Tu Mountain for the months-long Yen Tu Festival, climbing stone staircases through cloud-draped pine forests to mountaintop bronze shrines. Come in winter if you want mystery, silence, and spiritual weight—just leave your swimsuit at home.