The May-September Travel Weather Outlook for Southeast Asia

Every day, Khiri Travel teams are in touch with both travelers in Southeast Asia and worldwide travel professionals. A much bespoken subject is obviously ‘the weather.’ Is this a good time to travel for my clients? What is today’s temperature? Is it going to rain?

Especially the coming months of May till September are matters of concern. Not only to the visitor. The green season is also a returning lowdown for the local travel industry. Will my hotel have bookings these months? Where will I get my income from? Will my employer have enough jobs for me?

To help travel professionals advise their clients on visiting Southeast Asia in the green months, here is the Khiri Travel weather report for Southeast Asia for May to September 2015. We’ve included those places that see their top weather between May to September and added some unique reasons to visit right now!

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General outlookbest chance of sunshine: Gulf of Thailand west coast and north and northeast of the country.

Kanchanaburi: Mostly sunny with south-westerly breezes. Chance of occasional heavy showers, especially in the afternoon. Increased chance of cloud cover May and September. Average Highs of 34°C. Lows: 22°C.

Kanchanaburi houses the famous Erawan Waterfall, which due to the rainfall will see an increase of water flow making this seven level cascade even more impressive to visit at this time of year.

Hua Hin, Koh Samui: Extensive sunny periods with afternoon onshore breezes; occasional isolated showers possible. Average Highs 33°C. Lows 22°C.

These beaches are at one of their bests in July & August, making for a wonderful holiday of beach life combined with visits to Ang Thong Marine NP and snorkeling trips to the underwater world.

May: Samui Regatta and Fruit Festivals in Rayong/Chanthaburi

July: The Candle Festival – Ubon Ratchathani


General outlookbest chance of sunshine: north Vietnam and areas in Central Highlands; in the south widespread occasional showers.

Kontum: Average lowest temperatures in May with some occasional rain mixed with sunny spells; temperatures in Kontum reaching a peak in June; greater chance of rain July & August. Average Highs 24°C. Lows 18°C.

Dalat & Nha Trang: Some occasional rain in May-July and September, but mostly dry and pleasant temperatures; rainfall at its peak causing high humidity level in August. Average Highs 25°C. Lows 20°C.

Nha Trang coast is the perfect place to relax and to enjoy beach time – all year round. Called the City of Flowers, Dalat is blessed with beautiful sightseeing spots of wild forests and a colorful flower fields, fruits are abundant. During the wet season, the rain produces an effect in the Prenn Waterfalls, creating a yellow color in the water, which comes from the reflection of the sunlight, in between occasional rain.

Sapa: Mixed sunshine and occasional showers; chilly in the evenings. Greater chance of rain in July and August when scenery is at its greenest. Average Highs 34°C. Lows 18°C.

Visit in September when you can, when the harvest season starts and the rice fields are gorgeously gold.

September: Phan Thiet Mid-Autumn Festival – Vietnam


General outlookHot and occasionally wet; great chance of extensive sunny spells along northern inland mountain and Mekong River destinations; wetter in the southern provinces. Average Highs 34°C. Lows 17°C in the hills, 22°C along the Mekong.

Luang Prabang: Extended blue skies, mostly sun in the mornings, especially in May. September with irregular showers, mostly in the afternoon; June to August increased cloud. Average Highs 33°C. Lows 23°C.

Come for the festivals celebrated on behalf of Buddhist Lent and falls like the Kuang Si Waterfall, which are at their biggest towards August and September.

May: Boun Bang Fai Rocket Festival – Laos and North Eastern Thailand

September: Boat Racing Festival – Luang Prabang & Boun Khao Padap Dinh


General outlookHot with sunny spells interspersed with rainfall, which can be heavy and prolonged on the coast. Average Highs 34°C. Lows 24°C.

Siem Reap/Angkor: best chance of sunshine is in May with increased cloud cover and rain increasing towards September. Average Highs 31°C. Lows 24°C.

Besides the fact that visitors will experience thinner crowds at Angkor – now surrounded by green vegetation and moats filled with water –flora and fauna in the country is in full bloom in August and September. The rivers have filled up with water and therefore this period is the perfect time for traveling Cambodia’s lakes and waterways.


General outlookMixed sunny spells and rain showers, some of them prolonged on the coast. Central plains mostly dry with occasional showers in the afternoon. Average Highs 35°C inland (32°C on the coast). Lows. 25°C, cooler in the hills.

Bagan, Inle, Mandalay: temperature cooling off from May, with showers available anytime. Better chance of sunshine in July and refreshing rain every now and then from June to September. The rest of the day the weather is clear. Average Highs: 34C. Lows 24°C.

There are fewer tourists (a better choice of hotel rooms). June to September is cheaper. And best of all, Myanmar is at its best – green and refreshing.

August: Taung Byone Nat Festival – Taung Byone Village near Mandalay, Myanmar

Our professional teams in the region can give you the most up to date information on festivals, weather forecasts and the best low-season deals. To contact us, please leave your information in the yellow form below and we’ll get back to you shortly.

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