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Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the Current UK weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Check the live forecast above before you pack, as Koh Samui’s weather is split between a dry season and a wetter stretch. The best months for a visit are December to March, when you get more sun and less rain.
What is the weather like in Koh Samui by month?
Koh Samui’s climate is tropical, with a distinct dry season from December to March and a wetter period from October to November. The island sees its highest rainfall in November and October, so if you’re checking koh samui weather october or koh samui weather november, expect short, heavy showers. From December, conditions improve; koh samui weather december is usually sunny and warm. January stays dry and pleasant, making it a strong choice for a winter escape. For a broader view, look at koh samui weather by month to plan around your travel dates.
What should you pack for Koh Samui?
For the dry season, pack light cotton clothing, a rain jacket for the odd shower, and plenty of sun protection. If you’re visiting in the wetter months, a waterproof layer is essential. The live forecast above gives a good idea of current conditions, but for a longer outlook, check koh samui weather 14 days and koh samui weather 15 days for more detail. For a 30-day view, koh samui weather forecast 30 days helps with advance planning.
Is Koh Samui good to visit in December?
Yes, koh samui weather december is typically dry and sunny, with temperatures around 28°C. It’s one of the best months for a holiday, though it can be busy with UK travellers over the Christmas break.
Does it rain a lot in October?
Koh Samui weather october sees the start of the wet season, with frequent showers. It’s not constant rain, but you’ll want a rain jacket and flexible plans for outdoor activities.
What is the weather like in November?
Koh Samui weather november is the wettest month, with high humidity and short, heavy downpours. It’s still warm, so many visitors find it a good value option, but pack for rain.
For more on UK travel conditions, see our weather hub or check forecasts for Birmingham and Liverpool. For a longer outlook, visit 10 Day Weather Forecast UK.