Best time to visit Koh Samui for good weather

Best match

Songkran brings Thai New Year festivities — warm, slightly wetter, but culturally unmissable.

#1 for good weather

Best match

Driest month of the year: 42mm of rain, long sunny days, and a slight easing of the January crush.

#2 for good weather

Best match

Shoulder season opens: still excellent weather, noticeably cheaper, and a more relaxed pace.

#3 for good weather

Best match

Peak dry season: reliably sunny, warm, and the most visited month on the island.

#4 for good weather

Strong option

Pre-monsoon transition: good value, quiet, but afternoon rain becomes a daily reality.

#5 for good weather

Strong option

Second peak season: European summer holidays bring the crowds back to reliably sunny skies.

#6 for good weather

Strong option

Still peak with good but slightly less reliable weather — August is busier than July.

#7 for good weather

Strong option

Mixed month: decent value, quiet beaches, but frequent rain interrupts outdoor plans.

#8 for good weather

Worth considering

Shoulder low season: heavy rain returns and the crowds evaporate — beach time is a lottery.

#9 for good weather

Avoid

Monsoon peak: 305mm of rain and grey skies — the worst weather month on Koh Samui.

#10 for good weather

Avoid

Second-worst weather month: monsoon still raging, many resorts closed or at skeleton service.

#11 for good weather

Worth considering

Transitional: rain easing through the month, Christmas arrivals drive prices up before the payoff.

#12 for good weather