When is the rainy season in north Vietnam?
The rainy season in north Vietnam runs from May to September, with July and August the wettest months and the rain tailing off through October. April is a shoulder month that already gets meaningful showers, and the mountains hold onto the wet weather a few weeks longer than the lowlands do. One thing worth knowing: northern Vietnam does not work on a wet and dry split the way the south does. The north has four seasons, including a genuinely cold winter, so “rainy season” is shorthand for the wet half of summer rather than a hard line on the calendar. If you are still choosing dates, the best time to visit north Vietnam compares the whole year.
When is typhoon season in north Vietnam?
Typhoon season in north Vietnam runs from June to October, and the realistic window is July to September. Outside those months a storm reaching the north is unusual.
The part most guides miss is that typhoons move down the coast as the season progresses. Storms form in the western Pacific, cross the Philippines and enter the East Sea, and early in the season the tracks run high, toward southern China and the Gulf of Tonkin. That is why the north gets the first storms of the year. As the season goes on the tracks drop south, first toward Thanh Hoa and Vinh, then to Hue, Da Nang and Hoi An.
By October and November, when the news is full of flooding in Vietnam, it is almost always central Vietnam being hit. The north is drying out by then.
So the north’s typhoon risk is front-loaded and, across a full season, smaller than central Vietnam’s. In a typical year the north sees one or two storms make landfall or pass close enough to matter, and most bring a day or two of hard rain and wind rather than anything dramatic. The nationwide picture is in the typhoon season in Vietnam guide.
What the rainy season in north Vietnam is actually like
How it rains
The single most useful thing to understand is that rain here is short and heavy, not constant. A typical wet-season day in northern Vietnam starts clear or hazy, builds through the afternoon, and then dumps a serious amount of water in one or two hours. An hour later the streets are drying and people are back outside.
All-day rain does happen, usually when a storm system is passing, and it can last two or three days. But it is the exception, not the pattern. Plan your mornings properly and you will lose far less time than the forecast suggests.
Heat is the other half of it. Hanoi, Ninh Binh and the delta sit around 30 to 35 degrees in June and July with humidity that makes it feel worse, and the rain brings relief rather than misery. The mountains are the escape. Sapa, Ha Giang and Mu Cang Chai run around ten degrees cooler and are comfortable all summer.
The rainy season is also the sunniest season
This surprises almost everyone, and it is worth stating plainly. Hanoi gets roughly 6.5 hours of sunshine a day in July and about 1.5 hours a day in February. The wet months are more than four times sunnier than the dry ones.
The reason is that rain here comes and goes. A storm clears the air, and what follows is a hard blue sky and the best visibility of the year. The greyest weather in the north is the fine drizzle that settles in from around February to April, which barely registers as rainfall but blocks the sun for weeks.
Higher up the pattern is flatter. Sapa gets its sunniest months in spring and its cloudiest in June and October, but August is no darker than January.
What a typhoon is actually like
Most travellers who are in the north during a typhoon experience a rough day, not a disaster. Expect very heavy rain, strong wind, shops shuttered along the coast, and everything outdoors cancelled for 24 to 48 hours.
You are rarely caught out. Storms are tracked for three to five days before landfall, and Vietnamese authorities act early. Ports close, boats are recalled, and coastal areas are cleared well ahead of time.
What actually gets disrupted is transport and water activities. Halong Bay cruises stop, ferries to Cat Ba stop, domestic flights are delayed, and coastal roads flood. Inland cities like Hanoi mostly deal with heavy rain and local flooding, which clears fast. The effect on cruises is covered in Halong Bay in the rainy season.
Landslides and mountain roads
This is the real travel risk in the north, and it gets far less attention than typhoons.
Mountain roads in Ha Giang, Hoang Su Phi, Y Ty, Mu Cang Chai and around Ba Be are cut into steep slopes, and after a few days of heavy rain those slopes give way. Usually it is a small slide: rock and mud across one lane, cleared by an excavator in a few hours. Occasionally a road closes for a day or more, and in bad years sections wash out completely.
You cannot plan around it precisely, so plan around it loosely. Leave buffer time between mountain destinations, avoid tight connections, and never schedule a flight for the same evening you come down from the hills. Riding is a separate question, and the Ha Giang loop in the rain covers what wet roads mean on a motorbike.
North Vietnam rainy season month by month
The season is not one long block of rain. It builds through May, peaks hard in July and August, then fades through September and October. Here is what each month actually looks like in the north.
May
The start of the wet season, and one of the best months of the year to travel.
Rain arrives as short afternoon showers, often only a few days a week, and the mornings are usually clear. Temperatures climb into the low thirties in Hanoi and stay pleasant in the mountains. Typhoon risk is close to zero.
This is also when the high terraces are flooded and reflecting the sky, so you get good weather and a landscape most people never see. If you want the wet season without the downside, May in north Vietnam is the month.
June
Hot, humid and noticeably wetter. Hanoi and the delta can hit 35 degrees with humidity that makes walking around the Old Quarter tiring, and the afternoon storms get bigger.
The first typhoon of the season is possible from mid June, though July is more common. Mountain roads are generally still fine at this stage.
The mountains are the smart move now. Sapa, Ha Giang and Pu Luong are much cooler, and the rice is coming up green. Detail in June in north Vietnam.
July
The wettest month of the year, and the peak of typhoon risk in the north.
Rain is frequent and heavy, though still mostly in bursts. Expect a couple of genuinely washed-out days across a two-week trip, plus the possibility of a storm closing Halong Bay for a day or two. Landslides on mountain roads become a real consideration.
It is also the sunniest month in Hanoi, the emptiest month for tourism and the greenest for scenery, and prices in Sapa and Halong drop noticeably. Full picture in July in north Vietnam.
August
Almost as wet as July, and for many people the better month.
Storms are still common and the roads still slide, but the terraces are at their fullest and deepest green from top to bottom, and by the very end of the month the earliest fields around Sapa start turning yellow.
Temperatures ease slightly from the July peak. The trade-off is straightforward: the best landscape of the summer in exchange for accepting a few lost days. See August in north Vietnam.
September
The month the season breaks, and the best all-round month to visit.
Early September can still be wet and a late storm is possible, but rainfall drops sharply through the month and the humidity goes with it. By the last week the lowlands are largely dry, clear and comfortable. Typhoon tracks have started shifting south toward central Vietnam.
It is also harvest, so the terraces are gold. Weather detail in September in north Vietnam.
October
The rainy season is effectively over in the lowlands. Hanoi, Ninh Binh and Halong Bay are dry, clear and cool, with the best visibility of the year, and any typhoon news now almost certainly concerns Hue, Da Nang or further south.
The mountains lag behind. Sapa, Ha Giang and Mu Cang Chai still get real showers through October and can be cloudy, so do not treat the month as guaranteed sunshine up there. Roads are usually fine again by now.
The one thing you have missed is the rice, mostly cut by mid October. See October in north Vietnam.
What about the rest of the year?
November to April is the dry half, but dry does not mean bright. November and December are cool, clear and among the best months here. From roughly February to April the north gets a fine, persistent drizzle that produces very little rainfall and almost no sunshine, and Hanoi can sit under flat grey skies for weeks. Cold fog is common in the mountains in January and February. Typhoons are not a factor in any of these months.
Is it worth visiting north Vietnam in the rainy season?
Yes, for most people. Not for everyone, and the difference comes down to what you came for.
The case for going
The landscape is the main argument. The terraces in Sapa, Mu Cang Chai, Hoang Su Phi and Pu Luong are green and full through July and August and turn gold in September, and those are exactly the wet months. Come in the dry season and you get empty brown fields. The month-by-month detail is in the north Vietnam rice terraces guide.
Waterfalls are the same story. Ban Gioc in Cao Bang is at full force from July to September and drops to a thin trickle by spring, which is why people who arrive in March come away disappointed.
Then the practical benefits: far fewer travellers, easier bookings, and lower prices in Sapa and Halong Bay. Mornings are usually clear, so trekking in north Vietnam works well if you start early.
The case against
Some things genuinely suffer. Halong Bay is the big one: a closed port means a cancelled cruise, and that can happen at short notice. Beaches on Cat Ba and Quan Lan are unreliable in the same way.
Mountain roads are the other real cost. A landslide can turn a five-hour drive into a nine-hour one, or close a route entirely for a day.
Cities are hard work. Hanoi and Ninh Binh in July mean heat, humidity and sudden downpours, which is unpleasant if your plan is walking around all day.
What is not a good reason to avoid the season is grey skies. Summer is the brightest time of year in the north.
The verdict
Go in the rainy season if you are heading for the mountains, the rice terraces or the waterfalls, and if you have some flexibility in your route.
Think twice if your trip is built around Halong Bay, beaches, or a fixed itinerary with no spare days. In that case September works better than July, and October better still.
Practical tips for travelling north Vietnam in the rainy season
How to read the forecast properly
More trips get talked out of the north by a badly read forecast than by actual weather. A rain icon on every day of a ten-day forecast does not mean ten days of rain. It means there is a chance of rain at some point in each 24-hour window, which in a northern Vietnamese summer is almost always true.
The hourly view works the same way, and this is where most people still get it wrong. Six hours of rain icons in a row does not mean six hours of rain. Each icon is a probability for that hour, so a row of them usually means one heavy burst somewhere in that window and dry weather around it. Look at the percentage next to the icon rather than the icon itself. Forty percent at 2pm is not a washout, it is a reason to carry a poncho.
Rain radar beats both. It shows you what is actually coming and how far away it is, which is the difference between leaving now and waiting forty minutes with a coffee.
And ignore anything beyond about five days. Checking the weather for a trip that is three months away tells you nothing at all.
What to pack
- A light rain jacket rather than an umbrella. Wind on the coast and in the mountains makes umbrellas useless
- Quick-dry clothing. Cotton stays wet for days in this humidity
- Shoes with grip, plus sandals you do not mind soaking
- A dry bag or waterproof pouch for phone, camera and passport
- Spare socks, more than you think
- Power bank, since power cuts happen in storms
- Mosquito repellent, because standing water means mosquitoes
- Small towel and a spare plastic bag for wet clothes
Cheap plastic ponchos are sold on every street corner for the price of a coffee, so there is no need to buy an expensive one at home. The broader list is in the Vietnam packing list.
Getting around and planning routes
Build slack into the route. One buffer day per mountain destination is worth more than three spare days at the end of the trip, because that is where the delays happen.
Choose transport with the weather in mind. A private car with driver handles wet mountain roads far better than a motorbike, and it keeps your luggage dry. Overnight trains are the most weather-proof option of all, since they run when flights and roads do not, which makes the sleeper train a solid choice for Lao Cai and Haiphong. The full comparison is in how to get around north Vietnam.
Do not schedule an international flight for the evening you finish a mountain drive. Give it a night in Hanoi.
Halong Bay cruises and cancellations
Worth understanding before you book. When a storm approaches, the provincial authorities close the port and every boat stays in. It is not a decision the cruise company makes, and no amount of asking will change it.
Most operators reschedule rather than refund, so the practical protection is timing. Book Halong Bay early in your trip rather than the day before you fly home, and you keep a second chance. The Cat Ba ferry runs on the same rules and stops when the port closes.
Check the cancellation terms before paying, and be wary of non-refundable rates in July and August.
Planning your days
Front-load everything. Mornings are your reliable window in the wet season, so do the boat trip, the trek or the long drive early and leave the afternoon loose.
Keep an indoor option in reserve for each destination. Museums and the Old Quarter in Hanoi, caves in Ninh Binh, a cooking class or a massage anywhere. A wet afternoon is only a wasted afternoon if you had nothing else planned.
And do not book non-refundable day tours more than a couple of days ahead when a storm is on the map.
Staying comfortable and healthy
Mosquitoes are worse in the wet months, and dengue cases in Vietnam peak from around July to October. Repellent in the evening matters more than anything else, and there is more detail in the guides on mosquitoes and dengue.
Leeches appear on wet trails in the mountains. Harmless, unpleasant, and easier to avoid with long socks.
Clothes do not dry in summer humidity, so use the cheap laundry services that exist in every town rather than washing things in the sink.
Watch the heat as much as the rain. In Hanoi in July, dehydration will bother you long before a shower does.
Rainy season is not the same across Vietnam
This matters if your trip covers more than the north. Central Vietnam runs on a different calendar entirely. While Hanoi and Sapa are getting their heaviest rain in July and August, Hue, Da Nang, Hoi An and Nha Trang are usually in their best beach weather of the year.
It flips later on. Central Vietnam’s wet season runs from around September to December, and that is when the flooding you see in the news happens, by which point the north is dry and clear.
So a bad month in one region is often a good month in another, and a well-ordered route can dodge most of it. The full country picture is in the rainy season in Vietnam guide.
