When to visit Vietnam, region by region

Vietnam runs about 1,650 km from north to south, roughly the distance from London to Rome. The weather at the two ends is often doing opposite things. There is no month that is good everywhere. What there is instead is a set of trade-offs. The useful question is not "when should I go" but "what am I willing to give up".

When is the best time to visit Vietnam overall?

March and April are the least-compromised months for a trip covering the whole country. The north has warmed out of its winter damp and the central coast is still in its dry stretch. The south has not yet switched to its wet season. Nothing is at its individual peak, but nothing is at its worst either.

If you are only visiting one region, ignore that answer. A single-region trip has a much wider window, and the compromise disappears.

What is the weather like in northern Vietnam?

Northern Vietnam has a real winter. From November to April the north is dry and cool, which is the good half of the year for Hanoi, Ha Long Bay and the mountains. From May to October it is hot and humid with the year's rainfall.

The part that surprises people is the cold. Hanoi in January is not tropical. Sapa and Ha Giang in December and January can be genuinely cold, with mist that removes the view you came for. If the mountains are the point of the trip, the shoulder months either side of winter serve you better than the middle of it.

When should you avoid central Vietnam?

October and November are the months to avoid on the central coast. The centre is dry from roughly February to August and hot in the middle of that stretch. Its rain then arrives in a short, intense autumn window that coincides with the tail of the typhoon season.

Hoi An floods. Not as a rare disaster, but often enough that the old town has a routine for it. Shopfronts board up, boats appear in the streets, and the water recedes. If your trip is built around the central coast and your dates are fixed in autumn, build in slack.

Autumn is also the clearest case of the country's three climates pulling apart. A November trip that works beautifully in Ho Chi Minh City and Hanoi can hit the one region having its worst month.

How different are the three regions, in numbers?

Far enough apart to need separate plans. Hanoi drops to around 13-17°C in January while Saigon holds 26-28°C in the same month, and the two are about 1,150 km apart.

The centre is the odd one: its wettest months are September to December, which is exactly when the north and south are at their best.

When is southern Vietnam dry?

The south is dry from November to April, with daytime highs typically between 28 and 34°C. That is the season for the Mekong Delta and Phu Quoc, and it is reliable in a way the rest of the country is not.

The wet season, May to October, is less of an obstacle than it sounds. Southern rain tends to arrive as a heavy afternoon burst that clears, rather than a grey day. Plans that keep mornings for the outdoors survive it intact.

Does the northern winter have a catch?

One, and it is not the cold. Hanoi's air is at its worst from November to March, exactly when the weather is at its best, and the air quality guide sets out which mornings are worth checking.

Is it worth going in the rainy season?

Often, yes — outside the central coast in autumn. What a wet day actually looks like, and what shuts on one, is the subject of the rainy day guide. Wet-season travel in the north and south buys lower prices and fewer people at the sites that are unpleasant when crowded. Landscapes are green rather than parched. Rice terraces in the north are at their most photogenic in the wet months, not the dry ones.

The trade is real, though. Ha Long Bay cruises are cancelled when a storm approaches, and no operator will sail around it. Boat-dependent plans in the wet season need a spare day behind them, and the typhoon season guide sets out which months carry that risk and what else it closes.

What does each month actually look like?

Twelve rows, because "the dry season" means three different things depending on which end of the country you are standing in.

Two rows are worth reading twice. October is the north's best month and the centre's worst, which is why a Hanoi-and-Hoi An trip in October is the most common scheduling mistake here. April is the south's hottest, which nobody warns first-timers about.

Each month has a page of its own with the regional detail, the prices and what is on: January, February, March, April, May, June, July, August, September, October, November and December.

Which months are busiest and dearest?

Four separate peaks, and only one of them is foreign.

Tet is the first and the sharpest: domestic travel surges, fares rise and small businesses close. The 30 April and 1 May holidays produce a second wave on the beaches. June to August is the Vietnamese school holiday, which fills the central coast with domestic tourism and raises resort prices. Christmas and new year is the fourth, and it lands on Phu Quoc and the southern islands hardest.

The quiet months are September and October in the south, and May and June in the north — which are also, not coincidentally, the wet ones. The trip cost guide covers what the difference is actually worth in money.

What if you can only travel in July or August?

Go central, and accept an afternoon shower in the south. The centre — Da Nang, Hoi An, Quy Nhon — is at its best in exactly those months, and the flat sea is the reason to be there.

The north still works if the mountains matter: rain in Sapa and Ha Giang arrives as heavy bursts rather than all-day grey, and the terraces are green and full. What does not work in those months is the Mekong Delta as a beach trip or Phu Quoc as a swimming one, and shifting those to the centre solves most of it.

What about Tet?

The dates, the closures and the fares are set out in full in the Tet guide.

Tet, the lunar new year, is the one date that overrides the weather. It falls in late January or February and moves each year with the lunar calendar. In the week around it, domestic travel surges as families cross the country. Trains and internal flights book out, and many restaurants, shops and small operators close for several days.

None of that makes travel impossible, and the atmosphere is genuinely worth seeing. It does mean that arriving without checking the date is how people end up unable to book a train or find dinner. Look it up for your year before committing to flights.

So which month should you pick?

Work backwards from the region rather than the calendar. Pick where you are going — the places roundup is the shortlist — then find the months that suit it.

Hanoi, Ha Long and the north: October through April, skipping the coldest weeks if the mountains matter. Hoi An and the central beaches: February through August. The Mekong and the south: November through April.

Two footnotes to that. A trip built around swimming runs on its own calendar, set out in the beaches guide. And Da Lat ignores the whole argument, holding 14-23°C every month of the year.

Only a trip covering all three needs the compromise, and that compromise is March and April.

The weather is not the only calendar. Tet closes the country for a week and the other Vietnamese festivals are worth timing towards rather than around.

One caution on every figure here: these are seasonal patterns, not forecasts. A dry month can deliver a wet week, and the typhoon season does not read the calendar. Treat the table as the shape of the year, and check an actual forecast before you pack.