Best time to visit Koh Samui

Go inMarch and June

J29°F30°M32°A33°M33°J32°J32°A32°S32°O31°N29°D28°

A good summer alternative when Phuket is rainy.

Koh Samui month by month

Month	Rating	Avg high	Rain	Crowds	Flights	What’s on
January	Mixed	29°C	Wet	Peak crowds	Priciest	–
February	Mixed	30°C	Wet	Peak crowds	Priciest	–
March	Mixed	32°C	Some rain	Moderate	Average	–
April	Mixed	33°C	Mostly dry	Moderate	Average	–
May	Mixed	33°C	Some rain	Quiet	Cheapest	–
June	Good	32°C	Some rain	Quiet	Cheapest	–
July	Mixed	32°C	Some rain	Peak crowds	Priciest	–
August	Mixed	32°C	Some rain	Peak crowds	Priciest	–
September	Poor	32°C	Wet	Moderate	Average	–
October	Poor	31°C	Very wet	Quiet	Cheapest	Monsoon
November	Poor	29°C	Very wet	Moderate	Average	Monsoon
December	Poor	28°C	Very wet	Peak crowds	Priciest	Monsoon

Flights to Koh Samui are usually cheapest in May–June and October. The catch: highs reach 33°C in May.
Crowds and prices peak in July–August and December–February, so book early.
The heaviest rain falls in October–December.

Samui’s rainy season comes months later than Phuket’s on the other coast.

When is the best time to visit Koh Samui?

The best time to visit Koh Samui is March and June. A good summer alternative when Phuket is rainy.

What is the cheapest time to fly to Koh Samui?

Flights are usually cheapest in May–June and October, when demand is lowest.

When is Koh Samui busiest?

Koh Samui is busiest in July–August and December–February.

What is the weather like in Koh Samui?

April is the warmest month, with average highs of 33°C, and December the coolest at 28°C. The wettest period is September–February.