Best Time to Visit North Vietnam (and When to Avoid It)

Best time to visit northern Vietnam: why autumn wins

Autumn is the most reliable season in the North. By November, Hanoi averages about 27°C by day and 20°C at night, and rainfall drops to around 60 mm for the month, less than a quarter of what August brings. Ha Long Bay is drier still, with under 40 mm, and in the mountains the rain keeps easing through October and November.

If you ask me, the calendar is generous. In the lowlands, the truly comfortable weather often lasts only a few weeks, and my favorite stretch is late October into November: warm enough for a T-shirt at noon, cool enough to walk the Old Quarter all afternoon.

September is the month for golden rice terraces, but I no longer tell guests it is a safe bet for weather. Typhoon Yagi hit the North on September 7, 2024, and in 2025 three storms (Ragasa, Bualoi and Matmo) brought floods from late September to mid-October. Go for the harvest, but leave room in your plan.

Spring is the runner-up, especially late March and April: the mountains come alive with the festivals of the Hmong, Tay and Dao people after Tet (the Lunar New Year), but the air is humid and mornings are often misty.

North Vietnam weather by month

Sapa sits at 1,570 m and is usually 8 to 12°C cooler than Hanoi by day, while Ha Long Bay follows the rhythm of the coast. Here are the average daily highs and lows for the three places most travelers visit.

Average daily high / low, rounded. Source: Vietnam Institute for Building Science and Technology (Hanoi: Lang station, 1991 to 2020; Ha Long: Bai Chay station).

Weather in North Vietnam by season

Unlike the tropical South, which has a dry and a wet season, the North has a humid subtropical climate with four distinct seasons. Locals count spring from Tet, so the seasons below follow how the weather feels on the ground.

Spring (February to April)

Spring warms up quickly: Hanoi goes from about 22°C by day in February to 29°C by April, and around Tet, peach and plum blossoms cover the hills of Moc Chau and Ha Giang. The catch is "nồm": from late February through March, humidity stays above 85 to 90% for days, walls and floors literally sweat, and morning fog hides the views.

Summer (May to August)

The lowlands are hot and wet: Hanoi's average high peaks at about 35°C in June, heatwaves can pass 40°C (the record is 42.8°C), and August is the wettest month. This is the time to head for altitude. Sapa stays around 22 to 23°C by day, the terraces are deep green, and during the water-pouring season in Mu Cang Chai (late May to early June) the flooded fields reflect the sky like mirrors.

Autumn (September to November)

Autumn is the season most guides recommend, and I am one of them. Daytime temperatures in Hanoi ease from about 32°C in September to 27°C in November, humidity drops, and in October the scent of milk flowers (hoa sữa) drifts through the streets. September belongs to the rice terraces, while October and November bring the steadiest weather of the year.

Winter (December to January)

Do not underestimate winter. In January, Hanoi averages about 20°C by day and 14°C at night and Sapa 12°C and 6°C, and the damp air feels colder than the numbers suggest, especially since few buildings have central heating. Fog often covers the mountains, and snow falls on the highest peaks only in rare cold spells, but this is the season for cloud hunting above a sea of clouds on Fansipan or Y Ty.

When is the worst time to visit North Vietnam?

The worst time to visit North Vietnam is July to September, when storms can close Ha Long Bay and trigger landslides in the mountains. June and July bring the most oppressive heat in Hanoi, and late February to March brings damp, misty "nồm" weather that hides the views.

We believe in being upfront at Kampá Tour. The North is worth visiting all year, but these are the periods when the weather can genuinely disrupt your plans:

• Storm season (July to September, sometimes into October): When a storm warning is issued, the authorities in Quang Ninh stop tourist boats from leaving port, as they did for Typhoon Wipha in July 2025 and Typhoon Ragasa in September 2025, so an overnight cruise can be cancelled at the last minute. Inland, heavy rain can trigger landslides on the roads of Cao Bang, Ha Giang and Lao Cai.
• The "sauna" heat (June and July): With 35°C days and heavy humidity, sightseeing becomes an endurance test. I don't recommend this period for families with young children or older travelers unless the plan includes a pool and early-morning outings.
• The damp "nồm" season (late February to March): Fog can sit over Sapa, Ninh Binh and Ha Long Bay for days. Culture lovers visiting spring festivals may not mind; view-seekers usually do.
• Winter haze in Hanoi (roughly December to March): Cold, still air traps fine dust over the city, and on several days between December 2025 and March 2026, IQAir listed Hanoi among the ten most polluted cities in the world. The air clears as soon as you leave for the mountains or the bay; if you are sensitive, check the IQAir AirVisual app and wear a mask on hazy days.

Which month should you avoid in Hanoi?

If you can only skip one month in Hanoi, skip June. It is the hottest month, with an average high of about 35°C, and it opens the wettest stretch of the year. If air quality matters more to you than heat, watch the winter months, December to February.

Best time to visit by destination

The weather in Hanoi tells you little about the mountains a few hours away, so here is when to go to each place to avoid disappointment.

Hanoi Capital

• The Prime Window: October and November are the best months. Humidity drops, the "concrete sauna" of summer is gone and walking around Hoan Kiem Lake or the Old Quarter is a joy. March and April are decent alternatives, though skies are often grey.
• The Warning: Avoid June and July if you can, unless you enjoy 35°C days with heat radiating off the pavement.

👉 Read more about the top things to do in Hanoi like a local!

Halong Bay & Lan Ha Bay

• The Prime Window: Aim for October, November or April. November is dry (under 40 mm of rain on average) and still mild, at around 26°C by day.
• The Warning: Avoid July to September if your dates are tight. February and March bring the "crachin", a persistent drizzle and fog. It creates a moody, "Kong: Skull Island" atmosphere, but if you want emerald water and sunshine, you will be disappointed.

The same timing applies whether you choose the classic Halong or the quieter Lan Ha Bay.

👉 Read more: How to Choose the Right Cruise in Halong Bay

Ninh Binh

• The Prime Window: The rice fields around Tam Coc turn gold twice a year, from late May to early June and from late September to early October, for about two weeks each time. For cycling and boat trips in comfortable weather, October and November are best.
• The Warning: Ninh Binh shares Hanoi's summer heat, and in late February and March, mist can hang over the karsts for days.

👉 Read more: Ninh Binh, a local guide for first-time visitors

Sapa & Bac Ha

• The Prime Window: For the golden rice terraces, aim for late August to late September. For cloud hunting, December and January provide a dramatic, misty backdrop. For clear trekking weather, late October and November are the steadiest.
• The Warning: Do not expect green fields in winter (November to February); the terraces are brown and bare. July and August are the wettest months, and some trails turn to mud.

In January, my advice to guests who want views is not to build the whole trip around Sapa: fog can sit in the valley for days. If you go anyway, stay in a village rather than in town, treat every clear morning as a bonus, and plan a Sunday in Bac Ha, whose Sunday market runs year-round.

Mu Cang Chai

• The Prime Window: The terraces ripen in stages. Tu Le Valley and Khau Pha Pass turn gold first, from mid-August to early September, while La Pan Tan, Che Cu Nha and De Xu Phinh peak from mid-September to mid-October.
• The Warning: Outside the harvest and the water-pouring season (late May to early June), the hills are mostly bare soil.

Note that Mu Cang Chai belonged to Yen Bai province until July 2025, when Yen Bai merged into Lao Cai province.

>>> Discover: Mu Cang Chai decoded 2026: Complete guide for first-time visitors

Ha Giang and Cao Bang (The Extreme North)

• The Prime Window: The dry season from October to April is the safest time for the mountain roads, and late October to early December is the best stretch for trekking and riding. October and November are special: buckwheat flowers open white in late September and turn pink through October and November, and the Buckwheat Flower Festival usually takes place in mid to late November.
• The Warning: July to September is the riskiest period. Heavy rain can turn steep passes into landslide zones, and the storms of 2024 and 2025 hit Cao Bang particularly hard.

Ha Giang is now part of Tuyen Quang province. Next door, Cao Bang follows the same seasons and, in my experience, has much quieter roads. My advice for riders: if you have never ridden on wet mountain roads, the rainy months are not the time to learn. Hire an easy rider or travel by car.

How to plan a trip during storm season

The real risk in the rainy months is not constant rain but a storm that shuts down one region for a day or two. If that happens to the area you planned to visit, my advice is to reroute rather than cancel the whole trip: the North is big enough to have a Plan B.

• Check the weather: Storms can change course quickly. If a warning is issued, limit travel or stay put.
• Keep a buffer day: Leave a spare day around a Ha Long Bay cruise or a mountain loop, so a one-day closure doesn't break the itinerary.
• Have a Plan B route: When cruises are suspended, Ninh Binh and Mai Chau are the inland alternatives we suggest most often.
• Choose safe stays and pack smart: Pick well-built hotels with storm plans, and bring waterproofs, a flashlight, a power bank and bottled water.
• Stay connected: Share your plans with family, and check that your travel insurance covers weather disruption.

Many travelers assume monsoon months mean ruined holidays, but that's far from the truth. For more information, please read: Why Vietnam's Rainy Season Is Full of Surprises

Best time by traveler type

For Families

With kids or elderly parents, aim for November or late March to April, when daytime temperatures in Hanoi are mostly in the mid to high 20s, and avoid June to August. In December and January, the cold is less of a problem than the lack of heating in mountain homestays, so ask about heaters before you book.

For Photographers

Come from late August to early October for golden terraces, at spots such as Mam Xoi Hill in Mu Cang Chai or the Phong Nam Valley in Cao Bang, or in February for mist and peach blossoms if you prefer atmosphere to color.

For Budget Travelers

Target the shoulder seasons, May or early December, when crowds thin out and cruise rates are usually lower than in peak season. Do not assume the mountains are cheap in September: it is peak season for Vietnamese travelers chasing rice terrace photos, especially around the National Day holiday on September 2, and rooms in Sapa and Mu Cang Chai sell out early.

>>> Read More: Why "Going Private" is the Best Investment for Your Vietnam Vacation?

North and South Vietnam in one trip: which months work?

No single month is perfect for the whole country, but November and late February to March come closest. In November the North is dry and mild while the South is ending its wet season; in late February and March the South is dry and the North is warming up, though still misty.

If you ask me, the month people most often get wrong is October: lovely in the North, but central Vietnam, around Hue and Hoi An, is in its flood season from September to November. By late March, Ho Chi Minh City can already feel very hot at midday, so plan its museums and historical sites for the morning. For the full picture, see our region-by-region guide to the best time to visit Vietnam.

Is North or South Vietnam better?

Neither is better overall; it depends on when you go and what you want. The North suits mountains, trekking, history and cooler weather, and is at its best in October and November and again in March and April. The South suits beaches, river life and heat, and is driest from December to April.

The contrast is sharpest in December and January, when the North is cold and grey and the South is warm and dry; that is when I suggest giving more days to the South. See Vietnam in December: Weather & Top Places to Visit.

Match your route to the season

In my view, the season should shape the route, not the other way around. Here is how the two northern loops we design most often fit the calendar.

Late September to November, and March to April: the mountain loop

A 15-day trip to northern Vietnam crosses the northwest and northeast mountains, from Mu Cang Chai and Sapa to the Ha Giang Loop and Ba Be Lake. It is at its best when the harvest and buckwheat seasons line up, and again in spring.

December to February: a lower-altitude loop

When the high mountains are cold and foggy, our 10-day loop stays lower, through Mai Chau, Pu Luong, Ninh Binh and Ha Long Bay. It works in summer too, as long as the Ha Long night stays flexible from July.

Not sure where to start? This short video walks through the main areas you can reach from Hanoi.

Our Final Words

North Vietnam rewards travelers who time it well, and even the "wrong" months have something to offer if the route fits the weather. If your dates are already fixed, tell us when you are coming, and we will build the itinerary around the season. Happy travels!