Vietnam Temperature in May 2027, Region by Region

Vietnam temperature in May runs from 22°C by day in Sapa to 34°C in Hue, and almost everywhere is hot, humid and getting wetter. The central coast is the safe bet: Da Nang averages 33°C with 81 mm of rain over nine days and 247 hours of sun. The south starts its rainy season, Hanoi gets its first summer thunderstorms, and once the 30 April holiday is over the crowds thin until the schools break up.

Vietnam weather in May by region

Every figure in the table comes from one source, Vietnam's national climate standard QCVN 02:2022/BXD, rounded to whole numbers. They are long-term averages, not a forecast. Hoi An uses the Da Nang station and Phong Nha uses Dong Hoi. The standard has no Saigon station, so Saigon and the Mekong use Can Tho, 170 km south-west.

Averages hide the spikes. The May record is 41.3°C at the Hue station, 40.6°C at Da Nang and 40.5°C at Hanoi. In late May 2026 forecasters reported 38 to 40°C from Thanh Hoa to Da Nang, one of the three worst May heatwaves since 2021, and told people to stay out of direct sun from 11am to 4pm. Plan your days around that window.

The same comparison for every other month is in our guide to the best time to visit Vietnam.

Vietnam weather in April or May, and May or June

May is the month the south flips from dry to wet. Same dataset:

Can Tho goes from 6 rain days to 16 in a month. Hanoi jumps 4°C. The central coast barely changes, which is why it wins May. Our Vietnam in April guide covers the month before, when the south is still dry and the 30 April rush is the main risk, and Vietnam in June the month after.

Where to go in May: Da Nang, Hoi An and Hue

Put the coast first. Da Nang gets 81 mm of rain in May against 628 mm in October, and the sea is 28 to 29°C. Swim at My Khe before 9am, before the sand is too hot to walk on. In Hoi An, sit out the middle of the day and walk the old town after 5pm, when the lanterns come on.

Nha Trang is the other strong beach: 82 mm of rain, nine rain days and 259 hours of sun, the most of any station here. The Hoi An weather by month page shows how long this dry window lasts before the September storms.

Hue is the hot one, averaging 34°C with 12 thunderstorm days. Be at the Imperial City gate when it opens and save the royal tombs for a second morning. The Imperial City is open stone courtyards with very little shade, and by 11am it holds the heat.

Phong Nha is about four hours north of Hue by road, and in May a day in the jungle beats a day on hot stone. The Elephant Cave and Ma Da Valley trek runs daily for 1,950,000 VND, about US$74, from age nine, and ends with a 600 m swim through Tra Ang water cave.

The north in May: hot Hanoi, wet Sapa, clearer Ha Long

Hanoi averages 32°C by day and 25°C at night, with 15 rain days. Much of that rain falls in thunderstorms: the station logs 9 storm days in May against 6 in April. Walk the Old Quarter in the morning and keep a museum for the afternoon. The red flamboyant trees flower along the city's streets from May.

Flamboyant trees flower across Vietnam from May, and Hanoi's streets turn red with them.

Sapa is cool at 22°C by day and 16°C at night, and wet: 341 mm over 22 rain days, the most in the table. It is also planting season, when the terraces are flooded and hold the sky like mirrors. Trails turn to clay, so bring shoes with real grip. Our Sapa weather guide has the rain for every month.

Planting time in the northern hills, when the terraces are flooded and the seedlings go in.

Ha Long Bay doubles its sunshine from April, 178 hours against 89, so the limestone finally comes out of the haze. The sea is about 27°C. Bai Chay averages 6 thunderstorm days in May, so book kayaking for the morning.

The south in May: the rainy season starts

Saigon and the Mekong follow Can Tho: 16 rain days and 181 mm, up from 42 mm in April. Most of it comes as a hard storm in the late afternoon or evening that is over in an hour or two. In 2026 the monsoon was late, and forecasters dated the start of the southern rainy season to 16 May.

Mornings stay dry, which suits the Delta. Be at the Cai Rang floating market near Can Tho by 6am, when the trading is busiest. May is fruit season too: mango, rambutan, mangosteen and durian are piled on the boats.

Cai Rang floating market from above. The boats trade early, before the afternoon storms.

Phu Quoc is the month's trap. Rain jumps from 148 mm in April to 281 mm over 19 days, and the south-west monsoon pushes swell onto the west coast. If you go, stay on the sheltered east side near Sao beach, and read our Phu Quoc travel guide first. Da Lat turns wet as well: 212 mm and 21 rain days, at 25°C by day.

Festivals, holidays and crowds in May 2027

The month opens with one of the biggest domestic travel rushes of the year. Reunification Day falls on Friday 30 April 2027 and Labour Day on Saturday 1 May, and because 1 May falls on a Saturday, Monday 3 May is the day off in lieu, giving a four-day break. Over the same holidays in 2026, plus Hung Kings Day, Vietnam served about 12 million visitors and several coastal hubs passed 80% room occupancy.

Be where you want to be by 29 April and do not plan a long transfer before Tuesday 4 May. After that, May is quiet until the schools finish, by 31 May 2027, and Vietnamese families fill the beaches from June to August.

Ho Chi Minh's birthday falls on Wednesday 19 May. The Mausoleum in Hanoi opens that morning and the queue is long. The same night is Hoi An's monthly lantern night, the 14th day of the lunar month, when most electric lights in the old town go off by about 8pm.

Buddha's birthday, Phat Dan, is Thursday 20 May 2027, the 15th day of the fourth lunar month. It is not a public holiday, so shops and trains run as normal. Pagodas hang lanterns and serve free vegetarian meals, and Hue, Hanoi and Saigon hold the largest celebrations.

Thien Mu Pagoda on the Perfume River in Hue, one of the city's oldest temples.

Phong Nha in May

Hot outside, cool underground. Dong Hoi averages 32°C by day and 25°C at night, with 116 mm of rain over 10 days and 233 hours of sun, then June climbs to 34°C. Inside the caves and under the jungle canopy it can drop to about 23°C, and the Kong Collapse tour page names April to May as its best months, with dry trails.

Looking out of Phong Nha Cave to the river and the hills. The boats come in here from the town.

Kong Collapse is five days and four nights, 10 people at most, minimum age 16, for 35,000,000 VND, about US$1,330. The big day is a 100 metre abseil into the sinkhole in drops of 30, 20 and 50 metres, with lunch on a ledge partway down. It leaves on Tuesdays and Fridays, and Tuesday 4 May 2027 is the first departure after the holiday. The Kong Collapse safety process explains the health check before you go.

On your own, the 2027 ticket for Phong Nha Cave is 150,000 VND a person plus 700,000 VND per boat for up to 12 people, so a couple pays for the whole boat. Paradise Cave is 270,000 VND with the electric shuttle, and the Dark Cave package with zipline, kayak and mud bath is 450,000 VND. Our Phong Nha travel guide has the rest.

Every Jungle Boss tour runs in May. The only seasonal closures are Bach Ma and the two Do Quyen tours near Hue, from September to November.

What to wear in Vietnam in May

Pack for 33°C and a storm most afternoons: light clothes that dry overnight, a rain shell that fits in a day bag, a hat and plenty of sunscreen. Add thin long trousers or a skirt for pagodas and the Mausoleum, which want shoulders and knees covered. Sapa and Da Lat drop to 16°C at night, so a fleece earns its space.

For a cave trip, start with our jungle trek packing list. With river crossings, your shoes will be wet for days, so bring a pair you can ruin.