Best Time To Visit Koh Samui
A month-by-month guide to weather, crowds, and travel conditions in Koh Samui, Thailand.
About Koh Samui
Koh Samui is Thailand's relaxed island: palm-fringed Chaweng and Lamai beaches, waterfall inland, the wacky-gold Wat Plai Laem, and day trips to Ang Thong Marine Park's emerald lagoons. Quieter than Phuket, better serviced than the small islands — the middle path done well.
Monthly weather guide
The table below shows general climate patterns derived from Koh Samui's latitude and climate zone. These are not real-time forecasts — for current conditions, use the AI planner which pulls live data from Open-Meteo.
| Month | Temperature | Precipitation | Notes | Recommendation |
|---|---|---|---|---|
| January | Warm | Dry | Dry season — sunny and comfortable. | Best |
| February | Warm | Dry | Dry season — sunny and comfortable. | Best |
| March | Hot | Moderate | Shoulder season — transitional weather. | Good |
| April | Hot | Moderate | Shoulder season — transitional weather. | Good |
| May | Hot | Moderate | Shoulder season — transitional weather. | Good |
| June | Hot | High | Wet season — expect heavy showers and high humidity. | Avoid |
| July | Hot | High | Wet season — expect heavy showers and high humidity. | Avoid |
| August | Hot | High | Wet season — expect heavy showers and high humidity. | Avoid |
| September | Hot | Moderate | Shoulder season — transitional weather. | Good |
| October | Hot | Moderate | Shoulder season — transitional weather. | Good |
| November | Hot | Moderate | Shoulder season — transitional weather. | Good |
| December | Warm | Dry | Dry season — sunny and comfortable. | Best |
Best months to visit
January to March is Samui's driest window (its seasons run opposite Phuket's). October to December is the island's wettest stretch.
Current live conditions: Hot, breezy and bright — classic beach-island weather.
Shoulder season (also good)
Shoulder months offer fewer crowds and lower prices while weather remains acceptable.
Months to avoid
These months typically bring challenging weather (extreme heat, heavy rain, or cold). If you must travel during this period, plan indoor activities and check forecasts closer to your date.
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