Travelling Southeast Asia in May often gets unfairly dismissed because it marks the start of the “wet season” in parts of the region. In reality, May is one of the most underrated months to travel Southeast Asia, with fewer crowds, greener landscapes, clear blue skies and excellent value, if you know how to plan properly.
This guide breaks down what the weather is really like in May, exactly what to pack, and what you should book in advance when travelling through Cambodia, Laos, and Vietnam.
Is May a Good Time to Visit Southeast Asia?
Short answer: yes, with realistic expectations.
May sits in the shoulder season, meaning:
- It’s hot and humid
- Rain is possible, but rarely all‑day
- Tourist numbers drop noticeably
- Prices for hotels and tours soften
I spent the entire month of May in SE-Asia and saw three days of rain, all of which lasted only a couple of hours.
What the Weather Is Really Like in May (By Region)
Cambodia (Phnom Penh & Siem Reap)
May is a transition month in Cambodia, sitting between dry season and monsoon.
- Early May is dry
- Rainfall increases slightly toward the end of the month
- Heat is high, but showers bring relief
When I visited in May, I did not have any rain whatsoever. However, the weather is very humid so try to get activities out of the way in the early morning.
This is an excellent time to visit Angkor Wat with greener temple surroundings.
Laos (Luang Prabang & Vang Vieng)
Laos in May is beautifully green.
- Waterfalls like Kuang Si are at their best
- Rainfall is slightly increasing but still manageable
- Evenings remain calm and atmospheric
Laos’ slower pace makes it one of the most enjoyable countries to visit during shoulder season. During my time in Laos, I experienced an hour of rain in Vang Vieng, which quickly brightened up.
Vietnam (North to South)
Vietnam’s weather varies by region, but May is generally very workable:
- North (Hanoi, Ha Giang, Ninh Binh): warmer with occasional rain
- Central (Hoi An, Da Nang): some of the best weather of the year
- South (Ho Chi Minh City): humid with afternoon showers
This mix actually works well for a north‑to‑south itinerary, allowing you to chase better conditions as you go.
During my time I saw two days of rain in the north, which lasted only a few hours. In the centre there was no rain nor clouds whatsoever. And in the south, we had a rainy afternoon for a couple of hours along the Mekong river, and that was all.
What to Pack for Southeast Asia in May
Packing smart makes all the difference when travelling in hot, humid, and occasionally wet conditions.
Clothing essentials
- Lightweight, breathable clothing (linen, cotton, quick‑dry fabrics)
- Loose trousers or long skirts for temples
- A light rain jacket or poncho
- Comfortable walking sandals + breathable trainers
- Swimwear (you’ll use it constantly)
Practical must‑haves
- Compact umbrella
- Anti‑humidity hair products (trust me)
- Sunscreen (SPF is expensive locally) and lip balm with SPF – you don’t want to get burnt lips like me!
- Insect repellent (especially in Laos and rural Vietnam)
Tech & travel gear
- Waterproof phone pouch
- Dry bag or packing cubes
- Portable power bank
- Universal travel adapter
May is not the time for heavy fabrics, tight clothing, or anything that shows sweat easily.
What to Book in Advance (Even in Low Season)
While May is quieter, certain experiences still sell out or work better when pre‑booked – especially if you’re on a multi‑country route.
Flights between countries
- Regional flights can be limited
- Booking ahead keeps your route efficient
- Especially important for Laos connections
Angkor Wat & sunrise experiences
- Private tuk tuks and guides are best booked in advance
- Sunrise visits still attract crowds, even in May
Ha Long Bay / Lan Ha Bay cruises
- Higher‑end boats cap passenger numbers
- Pre‑booking ensures better cabins and itineraries
Adventure activities
Book ahead if you’re planning:
- Hot air ballooning (Vang Vieng)
- Paramotoring
- Multi‑day motorbike loops (Ha Giang)
These operate on limited schedules and are weather‑dependent.
Restaurants & special dinners
Fine‑dining spots and destination restaurants often require reservations regardless of season.
