Koh Samui Weather | UrbanMixr

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By Sophie Larkin, Culture & Events EditorReviewed by Eleni GeorgiouForecast data: Open-Meteo & national met services

Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the UrbanMixr weather desk. Data from national met services via Open-Meteo.

☁️28°C

OvercastKoh Samui AirportFeels like 33° · Wind 5 km/h · Humidity 82%

UV 9 Very HighSunrise 06:07Sunset 18:44

Today🌧️33°26°💧84%

Sat🌦️32°26°💧62%

Sun☁️32°27°💧71%

Mon🌦️33°27°💧59%

Tue🌦️33°25°💧53%

Wed🌦️31°25°💧76%

Thu🌦️29°25°💧77%

Live data from Open-Meteo · updates automatically ·

Koh Samui’s most reliable weather runs from December to April, with February and March offering the highest sunshine and lowest rainfall. November and October bring the heaviest downpours, but temperatures stay warm year-round, rarely dropping below 25°C.

Check the live forecast above for Koh Samui Airport before finalising your travel dates. Conditions can shift quickly in the transitional months, so the latest data is your best guide.

When is the best time to visit Koh Samui?

The dry season (December to April) is the sweet spot. Koh Samui weather December through February sees less rain, more sun, and calmer seas – ideal for beach days. Koh Samui weather January is similarly settled, while March and April are the hottest months. If you’re after value, the shoulder months of May and June still offer decent weather with fewer crowds. Koh Samui weather November and Koh Samui weather October are the wettest, so pack a rain jacket and expect short, heavy showers.

What should I pack for Koh Samui?

Lightweight, breathable clothing all year. For the dry season (December to April), sun cream, a hat and insect repellent are essential. For the wetter months (October to November), add a waterproof jacket and quick-dry footwear. Even in the rainy season, temperatures hover around 28–32°C, so you won’t need layers. Check koh samui weather 14 days and koh samui weather 15 days before you travel to fine-tune your kit. For longer-term planning, koh samui weather forecast 30 days gives a broad trend but not precise daily detail.

Average high32°C (March–April)

Wettest monthNovember (≈320mm rain)

Driest monthFebruary (≈40mm rain)

Peak tourist seasonDecember–February

Does it rain all day in Koh Samui in November?

No – November’s rain typically falls in short, heavy bursts, often in the afternoon or evening. Mornings can be bright and sunny, so you’ll still get beach time between showers.

Is Koh Samui hot in January?

Yes, comfortably warm. Daytime highs average 29–30°C, with lower humidity than later months. Evenings are mild, making it a popular escape from UK winter.

How reliable are 30-day forecasts for Koh Samui?

Useful for spotting general trends (e.g., start/end of rainy season) but not for daily planning. For accuracy, rely on 7–14 day forecasts closer to your trip.