Koh Samui in September
Koh Samui in September
Koh Samui, Thailand
Visiting Koh Samui in September means experiencing the wet season. As a tropical destination, expect warm temperatures year-round with higher rainfall and humidity.
Weather in Koh Samui in September
Average highs around 27.6C and lows near 23C. 130.7mm average precipitation and about 21 rainy days. September typically sits between August and October conditions, so it is useful for travelers wanting a balanced window in Koh Samui. Pack quick-dry clothing and a light waterproof layer for September.
Temperature
September brings wet season conditions in Koh Samui, Thailand. The average temperature is about 25.3C, with lows near 23C and highs around 27.6C.
Sunshine Hours
Koh Samui, Thailand usually gets around 8.9 hours of sunshine per day in September, with roughly 12.2 daylight hours available for sightseeing.
Rain
September sees around 130.7mm of rainfall over about 21 days. Rain can occur for around 8.6 hours per day on average.
Humidity
Humidity in September is generally humid for Koh Samui, Thailand, especially when rainfall periods increase.
Additional Information
Average winds are around 17.5 km/h, so pack layers that handle changing conditions. Pack quick-dry clothing and a light waterproof layer for September.
Our September Hotel Picks for Koh Samui
Bandara Spa Resort
Sophisticated quarters in a serene beachfront hideaway featuring 4 pools, 2 restaurants & a spa.
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Conrad Koh Samui
Swanky hillside resort featuring Gulf views & a spa, plus sleek villas with private infinity pools.
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Banyan Tree Samui
Posh villas with private pools & gardens in a plush resort offering a spa, a beach & chic dining.
View hotelWhat to Do in Koh Samui in September
Big Buddha Temple
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Explore activity
Wat Phra Chedi Laem Sor
Small, golden pagoda with ornate details in a serene oceanfront setting with a sandy beach.
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Choeng Mon Beach
Explore activityTravel tips for Koh Samui in September
Pack quick-dry clothing and a light waterproof layer for September. Book accommodation earlier when events overlap with peak weekends, and keep an eye on changing weather windows for day trips.
FAQ: Koh Samui in September
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