Weather in Thailand in September

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27° C



239 mm

per month


21 %



84 %


What’s the weather like in Thailand in September?

In September, Thailand experiences the transition from the southwest monsoon season to the northeast monsoon season. This means that the weather can vary across different regions of the country.

Average daily temperatures

In September, Thailand generally experiences warm and humid weather. The average daily temperature ranges from 25°C (77°F) to 32°C (90°F), making it a relatively hot month. However, the temperatures can vary depending on the region.

In popular tourist destinations such as Bangkok and Chiang Mai, temperatures can still reach highs of 33°C (91°F) during the day. Nighttime temperatures tend to be slightly cooler, averaging around 24°C (75°F).

It is important to note that in mountainous regions like Chiang Rai and Mae Hong Son, temperatures can drop significantly, especially at higher altitudes. It is advisable to pack some warm clothing if planning to visit these areas in September.

Sunshine and rainfall

In September, Thailand experiences a mix of sunshine and rainfall. The country receives an average of 150mm of rainfall during this month, so it is considered to be one of the wettest months of the year. However, rainfall patterns vary across different regions.

In coastal areas, such as Phuket and Krabi, September is characterized by frequent short showers followed by intervals of sunshine. The northeastern region, including destinations like Chiang Mai and Sukhothai, experiences more rainfall compared to other areas. The central region, including Bangkok and Ayutthaya, also receives a fair amount of rain.

Despite the rainfall, September still offers a good amount of sunshine. On average, Thailand receives around 6 hours of sunshine per day, making it possible to enjoy outdoor activities and explore the country’s beautiful attractions.