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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Story Native weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
The best time to visit Koh Samui is during the dry season, from December to March, when rainfall is low and sunshine is abundant. The live forecast above gives current conditions at Koh Samui Airport, but for planning, focus on seasonal averages.
What is the typical weather pattern in Koh Samui?
Koh Samui has a tropical monsoon climate with two main seasons. The dry season runs from December to March, offering warm temperatures around 28–30°C and low humidity. The wet season peaks in October and November, with heavy but short-lived downpours. April to September is a transitional period with increasing humidity and occasional rain.
How reliable are long-range forecasts for Koh Samui?
Forecasts beyond 7–10 days have limited accuracy in tropical climates. A koh samui weather 14 days outlook can give a general trend, but a koh samui weather forecast 30 days is unreliable for daily planning. Use the live forecast above for immediate decisions, and consult monthly averages for longer trips. Checking koh samui weather by month helps you pack appropriately: December and January are dry; October and November are wettest.
Is Koh Samui rainy in December?
December is one of the driest months. The koh samui weather december average is around 50–80 mm of rain, with plenty of sunshine. It is part of the peak tourist season for good reason.
What is the weather like in November?
November is still in the wet season. Koh Samui weather november sees frequent showers, often heavy but short. The average rainfall is higher than December, around 200–300 mm.
Can I trust a 15-day forecast for Koh Samui?
A koh samui weather 15 days forecast provides a general outlook but not precise daily details. For tropical destinations, the reliable range is 7–10 days. Use monthly averages as a guide for longer planning.
For more on UK conditions, see our UK weather hub or the 10 Day Weather Forecast UK. If you are planning a trip from the UK, you might also check Bristol Weather for departure conditions.