Is there a month that works everywhere?

Yes, from January to April, when all three are in their drier season. The catch is comfort rather than rain: the north is genuinely cold in January and February and often grey in March, while the central coast is at its driest of the year.

When is typhoon season?

Vietnam sees 6 to 8 typhoons or tropical cyclones a year, and the central coast carries the season most directly: Da Nang's wet and typhoon season runs September to December, with September to November the wettest months. A coastal trip in October is a real gamble, not a small one.

How cold does the north get?

Colder than people expect. Hanoi's coolest month averages 16.4°C, and Sapa in the mountains is colder again. December to February is genuinely jumper weather in the north while Ho Chi Minh City sits near its year-round average of 28°C.

Does the rainy season ruin a trip?

In the south, rarely. The rain there arrives as a heavy afternoon burst and then stops, and the city carries on around it. In the centre between September and December it is a different animal, with monthly rainfall from 550 to 1,000 mm at its peak, which is the kind of weather that closes boat trips.

What does this mean for my phone?

Two practical things. Wet season means indoor time and more hours on a phone, and it also means changed plans, which need a connection to rebook. A travel eSIM installed before you fly covers both, and the size to buy is worked out from your own days rather than an average.

When to go to Vietnam: month by month, north to south

When to go to Vietnam: three regions, three different years

Short answer

Vietnam has 3 climates at once. Hanoi is cool and dry from December to February and wet from May to October. Ho Chi Minh City is dry December to April and rainy May to November. The central coast runs opposite: dry January to August, then typhoon and wet season September to December.

Last checked: September 21, 2026

VietSIM sells prepaid Vietnam eSIMs. This guide mentions our store where it is relevant; the facts come from the sources listed at the end.

What each region is doing

Months	North: Hanoi, Sapa	Centre: Hue, Da Nang, Hoi An	South: Ho Chi Minh City
December to February	Cool and dry	Wet, easing	Dry season
March to April	Warming, some drizzle	Driest of the year	Dry, getting hot
May to August	Hot and wet	Dry and hot	Rainy season
September to November	Wet, easing by November	Typhoon and wet season	Rainy, ending

Disclosure: VietSIM sells prepaid eSIMs for Vietnam. The weather figures below come from published climate records, not from us.

Three climates, not one

The railway alone runs 1,726 km from end to end, and the seasons do not line up along it. The north has a monsoon-influenced humid subtropical climate with four distinct seasons. The centre and south are tropical, with a wet season and a dry one. Nationally, the rainy season delivers 80 to 90 percent of the annual rainfall, and the country sees 6 to 8 typhoons or tropical cyclones in a year.

That is why “when should I go to Vietnam” has no single answer, and why an itinerary that runs Hanoi to Ho Chi Minh City in October will meet two different years on the way.

The north

Hanoi has a dry, cool winter from December to February, with the coldest month averaging 16.4°C. The hot, rainy season runs May to September, and the year’s 1,612 mm of rain falls mostly between May and October. Spring brings drizzle and grey skies rather than downpours.

For Sapa and the mountains, subtract several degrees and add cloud. A winter trip north wants a proper jacket, which surprises people who packed for the tropics.

The centre

This is the region that decides most itineraries. Da Nang has a dry season from January to August and a typhoon and wet season from September to December. Its wettest stretch, September to November, brings between 550 and 1,000 mm a month, against 23 to 40 mm in the driest months of February to April.

Hoi An floods in some years. Boat trips, passes and beach days are the first things the weather takes away, so a trip built around them belongs between February and August.

The south

Ho Chi Minh City is tropical savanna, averaging 28°C all year with about 1,800 mm of rain. The rainy season runs May to November and the dry season December to April.

Southern rain behaves differently from northern rain: a heavy burst in the afternoon, then the streets dry and the evening carries on. It changes what you do for an hour, not what you do with a week.

Putting it together

January to April. The only stretch that is dry in all three, and the driest the central coast gets.
May to August. Good for the centre, hot and wet in the north, afternoon rain in the south.
September to November. Avoid building a central coast trip around these months.
December to February. Fine in the south, cold in the north, wet in the middle.

Once the dates are set, the rest is arrival logistics: Hanoi airport to the Old Quarter, Tan Son Nhat to District 1, and the overnight options in sleeper buses in Vietnam and the Reunification Express.

Wet weather means more hours on a phone and more plans rearranged from a bus seat, so size the plan in how much mobile data for Vietnam and buy it in the Vietnam eSIM store.