September Travel Guide for Southeast Asia

Here are our recommendations for where to go and what to do during September in Southeast Asia.


In the north rainy season is in full effect but will mostly consist of rain each day during mid to late afternoon downpours than often last only an hour or so before it starts to dry out again. Night-time storms also happen and can provide incredible light shows. Temperatures are in the low 30’s/86-91°F and pleasant at night.

Rainy season in Bangkok with average temperatures around 29°C/84°F and 5 or 6 hours of sunshine a day. Torrential showers are common however which can sometimes lead to flooding.

The Monsoon starts in September on Koh Samui which can see very heavy rain, usually in short bursts. There can still be some very nice days. Temperatures are still around 30°C/86°F.

On the Andaman Sea coast the south west monsoon hits the area from June to October when rainfall can hit highs of 350mm in a month. It’s not all bad though as the rain tends to fall in the late afternoon or early evening and the rest of the day could be bathed in hot sunshine as temperatures remain in the 30’s most of the day.

Picture Chiang Mai, Thailand. Credit Flyingdog Travel


A transitional month throughout the country as rainfall decreases on the western side of the peninsula while on the eastern side winds increase and temperatures start to fall although it is still generally very pleasant.

Malaysia Day is celebrated on 16th September.

Prophet Muhammad’s birthday is a national holiday. 8th October 2022, 27th September 2023, 15th September 2024.

Picture Sabah, Malaysia. Credit Hugo D on Unsplash


One of the wettest months of the year and rainfall can last for a number of hours, or longer, and be very heavy. Outside of the rain the weather tends to be very pleasant however.

Constitution Day is a public holiday celebrating the Cambodian government’s transformation to a constitutional monarchy on the 24th September in 1993. The holiday is on the following Monday if the date falls on a weekend.

Picture Angkor Wat, Siem Reap, Cambodia. Credit Flyingdog Travel


In the north rainy season is in full flow and the risk of typhoons increases. Temperatures can be unbearably hot at times.

September is the start of the monsoon season in central Vietnam and rainfall rapidly increases throughout the month. Temperatures start to decrease to more comfortable levels however.

Generally the wettest month of the year in the south and typhoons are a risk. Temperatures are also high, uncomfortably so at times.

Picture Ha Long Bay, Vietnam. Credit Taylor Simpson on Unsplash


There is not really a bad time to visit Singapore, September is the end of the Southwest Monsoon but any rainfall tends to be in short, sharp showers.

Picture Super Tree Grove, Singapore. Credit Coleen Rivas on Unsplash


An excellent time to visit Indonesia with temperatures a little higher and still sunny and dry although rainfall increases as the month progresses. Peak time for snorkelling, scuba diving and mountain trekking.

The birthday of the Prophet Muhammad is a public holiday in Indonesia, 8th October 2022, 27th September 2023, 15th September 2024.

Picture Nusa Penida, Bali, Indonesia. Credit Ella Hanson on Unsplash


Very heavy rainfall and typhoons but temperatures are at least starting to fall making it more comfortable although still very warm. The best weather is generally in the southern and eastern islands.

Picture Small Lagoon, Philippines. Credit Jules Bss on Unsplash


Peak rainy season and the length and frequency of rainfall increases which can cause transport issues at times. Temperatures start to fall to more comfortable, warm levels.

Picture Thakhek, Laos

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